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# String

`public final class String`
`extends Object` `implements Serializable, Comparable<String>, CharSequence`

java.lang.Object
↳ | java.lang.String

The `String` class represents character strings. All string literals in Java programs, such as `"abc"`, are implemented as instances of this class.

Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example:

>          String str = "abc";

is equivalent to:

>          char data[] = {'a', 'b', 'c'};
>          String str = new String(data);

Here are some more examples of how strings can be used:

>          System.out.println("abc");
>          String cde = "cde";
>          System.out.println("abc" + cde);
>          String c = "abc".substring(2,3);
>          String d = cde.substring(1, 2);

The class `String` includes methods for examining individual characters of the sequence, for comparing strings, for searching strings, for extracting substrings, and for creating a copy of a string with all characters translated to uppercase or to lowercase. Case mapping is based on the Unicode Standard version specified by the `Character` class.

The Java language provides special support for the string concatenation operator ( + ), and for conversion of other objects to strings. String concatenation is implemented through the `StringBuilder`(or `StringBuffer`) class and its `append` method. String conversions are implemented through the method `toString`, defined by `Object` and inherited by all classes in Java. For additional information on string concatenation and conversion, see Gosling, Joy, and Steele, The Java Language Specification.

Unless otherwise noted, passing a `null` argument to a constructor or method in this class will cause a `NullPointerException` to be thrown.

A `String` represents a string in the UTF-16 format in which supplementary characters are represented by surrogate pairs (see the section Unicode Character Representations in the `Character` class for more information). Index values refer to `char` code units, so a supplementary character uses two positions in a `String`.

The `String` class provides methods for dealing with Unicode code points (i.e., characters), in addition to those for dealing with Unicode code units (i.e., `char` values).

See also:

- `Object.toString()`
- `StringBuffer`
- `StringBuilder`
- `Charset`

## Summary

### Fields
`public static final Comparator<String>` | `CASE_INSENSITIVE_ORDER` A Comparator that orders `String` objects as by `compareToIgnoreCase`.

### Public constructors
`String()` Initializes a newly created `String` object so that it represents an empty character sequence.
`String(String original)` Initializes a newly created `String` object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string.
`String(char[] value)` Allocates a new `String` so that it represents the sequence of characters currently contained in the character array argument.
`String(char[] value, int offset, int count)` Allocates a new `String` that contains characters from a subarray of the character array argument.
`String(int[] codePoints, int offset, int count)` Allocates a new `String` that contains characters from a subarray of the Unicode code point array argument.
`String(byte[] ascii, int hibyte, int offset, int count)` This constructor is deprecated. This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the `String` constructors that take a `Charset`, charset name, or that use the platform's default charset.
`String(byte[] ascii, int hibyte)` This constructor is deprecated. This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the `String` constructors that take a `Charset`, charset name, or that use the platform's default charset.
`String(byte[] bytes, int offset, int length, String charsetName)` Constructs a new `String` by decoding the specified subarray of bytes using the specified charset.
`String(byte[] bytes, int offset, int length, Charset charset)` Constructs a new `String` by decoding the specified subarray of bytes using the specified charset.
`String(byte[] bytes, String charsetName)` Constructs a new `String` by decoding the specified array of bytes using the specified charset.
`String(byte[] bytes, Charset charset)` Constructs a new `String` by decoding the specified array of bytes using the specified charset.
`String(byte[] bytes, int offset, int length)` Constructs a new `String` by decoding the specified subarray of bytes using the platform's default charset.
`String(byte[] bytes)` Constructs a new `String` by decoding the specified array of bytes using the platform's default charset.
`String(StringBuffer buffer)` Allocates a new string that contains the sequence of characters currently contained in the string buffer argument.
`String(StringBuilder builder)` Allocates a new string that contains the sequence of characters currently contained in the string builder argument.

### Public methods
`char` | `charAt(int index)` Returns the `char` value at the specified index.
`int` | `codePointAt(int index)` Returns the character (Unicode code point) at the specified index.
`int` | `codePointBefore(int index)` Returns the character (Unicode code point) before the specified index.
`int` | `codePointCount(int beginIndex, int endIndex)` Returns the number of Unicode code points in the specified text range of this `String`.
`int` | `compareTo(String anotherString)` Compares two strings lexicographically.
`int` | `compareToIgnoreCase(String str)` Compares two strings lexicographically, ignoring case differences.
`String` | `concat(String str)` Concatenates the specified string to the end of this string.
`boolean` | `contains(CharSequence s)` Returns true if and only if this string contains the specified sequence of char values.
`boolean` | `contentEquals(StringBuffer sb)` Compares this string to the specified `StringBuffer`.
`boolean` | `contentEquals(CharSequence cs)` Compares this string to the specified `CharSequence`.
`static String` | `copyValueOf(char[] data, int offset, int count)` Equivalent to `valueOf(char[], int, int)`.
`static String` | `copyValueOf(char[] data)` Equivalent to `valueOf(char[])`.
`boolean` | `endsWith(String suffix)` Tests if this string ends with the specified suffix.
`boolean` | `equals(Object anObject)` Compares this string to the specified object.
`boolean` | `equalsIgnoreCase(String anotherString)` Compares this `String` to another `String`, ignoring case considerations.
`static String` | `format(Locale l, String format, Object... args)` Returns a formatted string using the specified locale, format string, and arguments.
`static String` | `format(String format, Object... args)` Returns a formatted string using the specified format string and arguments.
`byte[]` | `getBytes(String charsetName)` Encodes this `String` into a sequence of bytes using the named charset, storing the result into a new byte array.
`byte[]` | `getBytes()` Encodes this `String` into a sequence of bytes using the platform's default charset, storing the result into a new byte array.
`byte[]` | `getBytes(Charset charset)` Encodes this `String` into a sequence of bytes using the given charset, storing the result into a new byte array.
`void` | `getBytes(int srcBegin, int srcEnd, byte[] dst, int dstBegin)` This method is deprecated. This method does not properly convert characters into bytes. As of JDK 1.1, the preferred way to do this is via the `getBytes()` method, which uses the platform's default charset.
`void` | `getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)` Copies characters from this string into the destination character array.
`int` | `hashCode()` Returns a hash code for this string.
`int` | `indexOf(int ch, int fromIndex)` Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.
`int` | `indexOf(String str)` Returns the index within this string of the first occurrence of the specified substring.
`int` | `indexOf(int ch)` Returns the index within this string of the first occurrence of the specified character.
`int` | `indexOf(String str, int fromIndex)` Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
`String` | `intern()` Returns a canonical representation for the string object.
`boolean` | `isEmpty()` Returns `true` if, and only if, `length()` is `0`.
`static String` | `join(CharSequence delimiter, CharSequence... elements)` Returns a new String composed of copies of the `CharSequence elements` joined together with a copy of the specified `delimiter`.
`static String` | `join(CharSequence delimiter, Iterable<? extends CharSequence> elements)` Returns a new `String` composed of copies of the `CharSequence elements` joined together with a copy of the specified `delimiter`.
`int` | `lastIndexOf(int ch)` Returns the index within this string of the last occurrence of the specified character.
`int` | `lastIndexOf(String str, int fromIndex)` Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index.
`int` | `lastIndexOf(String str)` Returns the index within this string of the last occurrence of the specified substring.
`int` | `lastIndexOf(int ch, int fromIndex)` Returns the index within this string of the last occurrence of the specified character, searching backward starting at the specified index.
`int` | `length()` Returns the length of this string.
`boolean` | `matches(String regex)` Tells whether or not this string matches the given regular expression.
`int` | `offsetByCodePoints(int index, int codePointOffset)` Returns the index within this `String` that is offset from the given `index` by `codePointOffset` code points.
`boolean` | `regionMatches(boolean ignoreCase, int toffset, String other, int ooffset, int len)` Tests if two string regions are equal.
`boolean` | `regionMatches(int toffset, String other, int ooffset, int len)` Tests if two string regions are equal.
`String` | `replace(CharSequence target, CharSequence replacement)` Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence.
`String` | `replace(char oldChar, char newChar)` Returns a string resulting from replacing all occurrences of `oldChar` in this string with `newChar`.
`String` | `replaceAll(String regex, String replacement)` Replaces each substring of this string that matches the given regular expression with the given replacement.
`String` | `replaceFirst(String regex, String replacement)` Replaces the first substring of this string that matches the given regular expression with the given replacement.
`String[]` | `split(String regex, int limit)` Splits this string around matches of the given regular expression.
`String[]` | `split(String regex)` Splits this string around matches of the given regular expression.
`boolean` | `startsWith(String prefix)` Tests if this string starts with the specified prefix.
`boolean` | `startsWith(String prefix, int toffset)` Tests if the substring of this string beginning at the specified index starts with the specified prefix.
`CharSequence` | `subSequence(int beginIndex, int endIndex)` Returns a character sequence that is a subsequence of this sequence.
`String` | `substring(int beginIndex, int endIndex)` Returns a string that is a substring of this string.
`String` | `substring(int beginIndex)` Returns a string that is a substring of this string.
`char[]` | `toCharArray()` Converts this string to a new character array.
`String` | `toLowerCase()` Converts all of the characters in this `String` to lower case using the rules of the default locale.
`String` | `toLowerCase(Locale locale)` Converts all of the characters in this `String` to lower case using the rules of the given `Locale`.
`String` | `toString()` This object (which is already a string!) is itself returned.
`String` | `toUpperCase(Locale locale)` Converts all of the characters in this `String` to upper case using the rules of the given `Locale`.
`String` | `toUpperCase()` Converts all of the characters in this `String` to upper case using the rules of the default locale.
`String` | `trim()` Returns a string whose value is this string, with any leading and trailing whitespace removed.
`static String` | `valueOf(boolean b)` Returns the string representation of the `boolean` argument.
`static String` | `valueOf(double d)` Returns the string representation of the `double` argument.
`static String` | `valueOf(char[] data, int offset, int count)` Returns the string representation of a specific subarray of the `char` array argument.
`static String` | `valueOf(float f)` Returns the string representation of the `float` argument.
`static String` | `valueOf(int i)` Returns the string representation of the `int` argument.
`static String` | `valueOf(char c)` Returns the string representation of the `char` argument.
`static String` | `valueOf(long l)` Returns the string representation of the `long` argument.
`static String` | `valueOf(Object obj)` Returns the string representation of the `Object` argument.
`static String` | `valueOf(char[] data)` Returns the string representation of the `char` array argument.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.lang.Comparable`
`abstract int` | `compareTo(String o)` Compares this object with the specified object for order.
From interface `java.lang.CharSequence`
`abstract char` | `charAt(int index)` Returns the `char` value at the specified index.
`default IntStream` | `chars()` Returns a stream of `int` zero-extending the `char` values from this sequence.
`default IntStream` | `codePoints()` Returns a stream of code point values from this sequence.
`abstract int` | `length()` Returns the length of this character sequence.
`abstract CharSequence` | `subSequence(int start, int end)` Returns a `CharSequence` that is a subsequence of this sequence.
`abstract String` | `toString()` Returns a string containing the characters in this sequence in the same order as this sequence.

## Fields

### CASE_INSENSITIVE_ORDER

    public static final Comparator<String> CASE_INSENSITIVE_ORDER

A Comparator that orders `String` objects as by `compareToIgnoreCase`. This comparator is serializable.

Note that this Comparator does not take locale into account, and will result in an unsatisfactory ordering for certain locales. The java.text package provides Collators to allow locale-sensitive ordering.

See also:

- `Collator.compare(String, String)`

## Public constructors

### String

    public String ()

Initializes a newly created `String` object so that it represents an empty character sequence. Note that use of this constructor is unnecessary since Strings are immutable.

### String

    public String (String original)

Initializes a newly created `String` object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string. Unless an explicit copy of `original` is needed, use of this constructor is unnecessary since Strings are immutable.

Parameters
`original` | `String`: A `String`

### String

    public String (char[] value)

Allocates a new `String` so that it represents the sequence of characters currently contained in the character array argument. The contents of the character array are copied; subsequent modification of the character array does not affect the newly created string.

Parameters
`value` | `char`: The initial value of the string

### String

    public String (char[] value,
                    int offset,
                    int count)

Allocates a new `String` that contains characters from a subarray of the character array argument. The `offset` argument is the index of the first character of the subarray and the `count` argument specifies the length of the subarray. The contents of the subarray are copied; subsequent modification of the character array does not affect the newly created string.

Parameters
`value` | `char`: Array that is the source of characters
`offset` | `int`: The initial offset
`count` | `int`: The length

Throws
`IndexOutOfBoundsException` | If the `offset` and `count` arguments index characters outside the bounds of the `value` array

### String

    public String (int[] codePoints,
                    int offset,
                    int count)

Allocates a new `String` that contains characters from a subarray of the Unicode code point array argument. The `offset` argument is the index of the first code point of the subarray and the `count` argument specifies the length of the subarray. The contents of the subarray are converted to `char`s; subsequent modification of the `int` array does not affect the newly created string.

Parameters
`codePoints` | `int`: Array that is the source of Unicode code points
`offset` | `int`: The initial offset
`count` | `int`: The length

Throws
`IllegalArgumentException` | If any invalid Unicode code point is found in `codePoints`
`IndexOutOfBoundsException` | If the `offset` and `count` arguments index characters outside the bounds of the `codePoints` array

### String

    public String (byte[] ascii,
                    int hibyte,
                    int offset,
                    int count)

This constructor is deprecated.
This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the `String` constructors that take a `Charset`, charset name, or that use the platform's default charset.

Allocates a new `String` constructed from a subarray of an array of 8-bit integer values.

The `offset` argument is the index of the first byte of the subarray, and the `count` argument specifies the length of the subarray.

Each `byte` in the subarray is converted to a `char` as specified in the method above.

Parameters
`ascii` | `byte`: The bytes to be converted to characters
`hibyte` | `int`: The top 8 bits of each 16-bit Unicode code unit
`offset` | `int`: The initial offset
`count` | `int`: The length

Throws
`IndexOutOfBoundsException` | If the `offset` or `count` argument is invalid

See also:

- `String(byte[], int)`
- `String(byte[], int, int, java.lang.String)`
- `String(byte[], int, int, java.nio.charset.Charset)`
- `String(byte[], int, int)`
- `String(byte[], java.lang.String)`
- `String(byte[], java.nio.charset.Charset)`
- `String(byte[])`

### String

    public String (byte[] ascii,
                    int hibyte)

This constructor is deprecated.
This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the `String` constructors that take a `Charset`, charset name, or that use the platform's default charset.

Allocates a new `String` containing characters constructed from an array of 8-bit integer values. Each character cin the resulting string is constructed from the corresponding component b in the byte array such that:

>          c == (char)(((hibyte & 0xff) << 8)
>                              | (b & 0xff))

Parameters
`ascii` | `byte`: The bytes to be converted to characters
`hibyte` | `int`: The top 8 bits of each 16-bit Unicode code unit

See also:

- `String(byte[], int, int, java.lang.String)`
- `String(byte[], int, int, java.nio.charset.Charset)`
- `String(byte[], int, int)`
- `String(byte[], java.lang.String)`
- `String(byte[], java.nio.charset.Charset)`
- `String(byte[])`

### String

    public String (byte[] bytes,
                    int offset,
                    int length,
                    String charsetName)

Constructs a new `String` by decoding the specified subarray of bytes using the specified charset. The length of the new `String` is a function of the charset, and hence may not be equal to the length of the subarray.

The behavior of this constructor when the given bytes are not valid in the given charset is unspecified. The `CharsetDecoder` class should be used when more control over the decoding process is required.

Parameters
`bytes` | `byte`: The bytes to be decoded into characters
`offset` | `int`: The index of the first byte to decode
`length` | `int`: The number of bytes to decode
`charsetName` | `String`: The name of a supported charset

Throws
`UnsupportedEncodingException` | If the named charset is not supported
`IndexOutOfBoundsException` | If the `offset` and `length` arguments index characters outside the bounds of the `bytes` array

### String

    public String (byte[] bytes,
                    int offset,
                    int length,
                    Charset charset)

Constructs a new `String` by decoding the specified subarray of bytes using the specified charset. The length of the new `String` is a function of the charset, and hence may not be equal to the length of the subarray.

This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement string. The `CharsetDecoder` class should be used when more control over the decoding process is required.

Parameters
`bytes` | `byte`: The bytes to be decoded into characters
`offset` | `int`: The index of the first byte to decode
`length` | `int`: The number of bytes to decode
`charset` | `Charset`: The charset to be used to decode the `bytes`

Throws
`IndexOutOfBoundsException` | If the `offset` and `length` arguments index characters outside the bounds of the `bytes` array

### String

    public String (byte[] bytes,
                    String charsetName)

Constructs a new `String` by decoding the specified array of bytes using the specified charset. The length of the new `String` is a function of the charset, and hence may not be equal to the length of the byte array.

The behavior of this constructor when the given bytes are not valid in the given charset is unspecified. The `CharsetDecoder` class should be used when more control over the decoding process is required.

Parameters
`bytes` | `byte`: The bytes to be decoded into characters
`charsetName` | `String`: The name of a supported charset

Throws
`UnsupportedEncodingException` | If the named charset is not supported

### String

    public String (byte[] bytes,
                    Charset charset)

Constructs a new `String` by decoding the specified array of bytes using the specified charset. The length of the new `String` is a function of the charset, and hence may not be equal to the length of the byte array.

This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement string. The `CharsetDecoder` class should be used when more control over the decoding process is required.

Parameters
`bytes` | `byte`: The bytes to be decoded into characters
`charset` | `Charset`: The charset to be used to decode the `bytes`

### String

    public String (byte[] bytes,
                    int offset,
                    int length)

Constructs a new `String` by decoding the specified subarray of bytes using the platform's default charset. The length of the new `String` is a function of the charset, and hence may not be equal to the length of the subarray.

The behavior of this constructor when the given bytes are not valid in the default charset is unspecified. The `CharsetDecoder` class should be used when more control over the decoding process is required.

Parameters
`bytes` | `byte`: The bytes to be decoded into characters
`offset` | `int`: The index of the first byte to decode
`length` | `int`: The number of bytes to decode

Throws
`IndexOutOfBoundsException` | If the `offset` and the `length` arguments index characters outside the bounds of the `bytes` array

### String

    public String (byte[] bytes)

Constructs a new `String` by decoding the specified array of bytes using the platform's default charset. The length of the new `String` is a function of the charset, and hence may not be equal to the length of the byte array.

The behavior of this constructor when the given bytes are not valid in the default charset is unspecified. The `CharsetDecoder` class should be used when more control over the decoding process is required.

Parameters
`bytes` | `byte`: The bytes to be decoded into characters

### String

    public String (StringBuffer buffer)

Allocates a new string that contains the sequence of characters currently contained in the string buffer argument. The contents of the string buffer are copied; subsequent modification of the string buffer does not affect the newly created string.

Parameters
`buffer` | `StringBuffer`: A `StringBuffer`

### String

    public String (StringBuilder builder)

Allocates a new string that contains the sequence of characters currently contained in the string builder argument. The contents of the string builder are copied; subsequent modification of the string builder does not affect the newly created string.

This constructor is provided to ease migration to `StringBuilder`. Obtaining a string from a string builder via the `toString` method is likely to run faster and is generally preferred.

Parameters
`builder` | `StringBuilder`: A `StringBuilder`

## Public methods

### charAt

    public char charAt (int index)

Returns the `char` value at the specified index. An index ranges from `0` to `length() - 1`. The first `char` value of the sequence is at index `0`, the next at index `1`, and so on, as for array indexing.

If the `char` value specified by the index is a surrogate, the surrogate value is returned.

Parameters
`index` | `int`: the index of the `char` value.

Returns
`char` | the `char` value at the specified index of this string. The first `char` value is at index `0`.

Throws
`IndexOutOfBoundsException` | if the `index` argument is negative or not less than the length of this string.

### codePointAt

    public int codePointAt (int index)

Returns the character (Unicode code point) at the specified index. The index refers to `char` values (Unicode code units) and ranges from `0` to `length()``- 1`.

If the `char` value specified at the given index is in the high-surrogate range, the following index is less than the length of this `String`, and the `char` value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the `char` value at the given index is returned.

Parameters
`index` | `int`: the index to the `char` values

Returns
`int` | the code point value of the character at the `index`

Throws
`IndexOutOfBoundsException` | if the `index` argument is negative or not less than the length of this string.

### codePointBefore

    public int codePointBefore (int index)

Returns the character (Unicode code point) before the specified index. The index refers to `char` values (Unicode code units) and ranges from `1` to `length`.

If the `char` value at `(index - 1)` is in the low-surrogate range, `(index - 2)` is not negative, and the `char` value at `(index - 2)` is in the high-surrogate range, then the supplementary code point value of the surrogate pair is returned. If the `char` value at `index - 1` is an unpaired low-surrogate or a high-surrogate, the surrogate value is returned.

Parameters
`index` | `int`: the index following the code point that should be returned

Returns
`int` | the Unicode code point value before the given index.

Throws
`IndexOutOfBoundsException` | if the `index` argument is less than 1 or greater than the length of this string.

### codePointCount

    public int codePointCount (int beginIndex,
                    int endIndex)

Returns the number of Unicode code points in the specified text range of this `String`. The text range begins at the specified `beginIndex` and extends to the `char` at index `endIndex - 1`. Thus the length (in `char`s) of the text range is `endIndex-beginIndex`. Unpaired surrogates within the text range count as one code point each.

Parameters
`beginIndex` | `int`: the index to the first `char` of the text range.
`endIndex` | `int`: the index after the last `char` of the text range.

Returns
`int` | the number of Unicode code points in the specified text range

Throws
`IndexOutOfBoundsException` | if the `beginIndex` is negative, or `endIndex` is larger than the length of this `String`, or `beginIndex` is larger than `endIndex`.

### compareTo

    public int compareTo (String anotherString)

Compares two strings lexicographically. The comparison is based on the Unicode value of each character in the strings. The character sequence represented by this `String` object is compared lexicographically to the character sequence represented by the argument string. The result is a negative integer if this `String` object lexicographically precedes the argument string. The result is a positive integer if this `String` object lexicographically follows the argument string. The result is zero if the strings are equal; `compareTo` returns `0` exactly when the `equals(java.lang.Object)` method would return `true`.

This is the definition of lexicographic ordering. If two strings are different, then either they have different characters at some index that is a valid index for both strings, or their lengths are different, or both. If they have different characters at one or more index positions, let k be the smallest such index; then the string whose character at position k has the smaller value, as determined by using the < operator, lexicographically precedes the other string. In this case, `compareTo` returns the difference of the two character values at position `k` in the two string -- that is, the value:

>      this.charAt(k)-anotherString.charAt(k)

If there is no index position at which they differ, then the shorter string lexicographically precedes the longer string. In this case, `compareTo` returns the difference of the lengths of the strings -- that is, the value:

>      this.length()-anotherString.length()

Parameters
`anotherString` | `String`: the `String` to be compared.

Returns
`int` | the value `0` if the argument string is equal to this string; a value less than `0` if this string is lexicographically less than the string argument; and a value greater than `0` if this string is lexicographically greater than the string argument.

### compareToIgnoreCase

    public int compareToIgnoreCase (String str)

Compares two strings lexicographically, ignoring case differences. This method returns an integer whose sign is that of calling `compareTo` with normalized versions of the strings where case differences have been eliminated by calling `Character.toLowerCase(Character.toUpperCase(character))` on each character.

Note that this method does not take locale into account, and will result in an unsatisfactory ordering for certain locales. The java.text package provides collators to allow locale-sensitive ordering.

Parameters
`str` | `String`: the `String` to be compared.

Returns
`int` | a negative integer, zero, or a positive integer as the specified String is greater than, equal to, or less than this String, ignoring case considerations.

See also:

- `Collator.compare(String, String)`

### concat

    public String concat (String str)

Concatenates the specified string to the end of this string.

If the length of the argument string is `0`, then this `String` object is returned. Otherwise, a `String` object is returned that represents a character sequence that is the concatenation of the character sequence represented by this `String` object and the character sequence represented by the argument string.

Examples:

>      "cares".concat("s") returns "caress"
>      "to".concat("get").concat("her") returns "together"

Parameters
`str` | `String`: the `String` that is concatenated to the end of this `String`.

Returns
`String` | a string that represents the concatenation of this object's characters followed by the string argument's characters.

### contains

    public boolean contains (CharSequence s)

Returns true if and only if this string contains the specified sequence of char values.

Parameters
`s` | `CharSequence`: the sequence to search for

Returns
`boolean` | true if this string contains `s`, false otherwise

### contentEquals

    public boolean contentEquals (StringBuffer sb)

Compares this string to the specified `StringBuffer`. The result is `true` if and only if this `String` represents the same sequence of characters as the specified `StringBuffer`. This method synchronizes on the `StringBuffer`.

Parameters
`sb` | `StringBuffer`: The `StringBuffer` to compare this `String` against

Returns
`boolean` | `true` if this `String` represents the same sequence of characters as the specified `StringBuffer`, `false` otherwise

### contentEquals

    public boolean contentEquals (CharSequence cs)

Compares this string to the specified `CharSequence`. The result is `true` if and only if this `String` represents the same sequence of char values as the specified sequence. Note that if the `CharSequence` is a `StringBuffer` then the method synchronizes on it.

Parameters
`cs` | `CharSequence`: The sequence to compare this `String` against

Returns
`boolean` | `true` if this `String` represents the same sequence of char values as the specified sequence, `false` otherwise

### copyValueOf

    public static String copyValueOf (char[] data,
                    int offset,
                    int count)

Equivalent to `valueOf(char[], int, int)`.

Parameters
`data` | `char`: the character array.
`offset` | `int`: initial offset of the subarray.
`count` | `int`: length of the subarray.

Returns
`String` | a `String` that contains the characters of the specified subarray of the character array.

Throws
`IndexOutOfBoundsException` | if `offset` is negative, or `count` is negative, or `offset+count` is larger than `data.length`.

### copyValueOf

    public static String copyValueOf (char[] data)

Equivalent to `valueOf(char[])`.

Parameters
`data` | `char`: the character array.

Returns
`String` | a `String` that contains the characters of the character array.

### endsWith

    public boolean endsWith (String suffix)

Tests if this string ends with the specified suffix.

Parameters
`suffix` | `String`: the suffix.

Returns
`boolean` | `true` if the character sequence represented by the argument is a suffix of the character sequence represented by this object; `false` otherwise. Note that the result will be `true` if the argument is the empty string or is equal to this `String` object as determined by the `equals(java.lang.Object)` method.

### equals

    public boolean equals (Object anObject)

Compares this string to the specified object. The result is `true` if and only if the argument is not `null` and is a `String` object that represents the same sequence of characters as this object.

Parameters
`anObject` | `Object`: The object to compare this `String` against

Returns
`boolean` | `true` if the given object represents a `String` equivalent to this string, `false` otherwise

See also:

- `compareTo(String)`
- `equalsIgnoreCase(String)`

### equalsIgnoreCase

    public boolean equalsIgnoreCase (String anotherString)

Compares this `String` to another `String`, ignoring case considerations. Two strings are considered equal ignoring case if they are of the same length and corresponding characters in the two strings are equal ignoring case.

Two characters `c1` and `c2` are considered the same ignoring case if at least one of the following is true:

- The two characters are the same (as compared by the `==` operator)
- Applying the method `Character.toUpperCase(char)` to each character produces the same result
- Applying the method `Character.toLowerCase(char)` to each character produces the same result

Parameters
`anotherString` | `String`: The `String` to compare this `String` against

Returns
`boolean` | `true` if the argument is not `null` and it represents an equivalent `String` ignoring case; `false` otherwise

See also:

- `equals(Object)`

### format

    public static String format (Locale l,
                    String format,
                    Object... args)

Returns a formatted string using the specified locale, format string, and arguments.

Parameters
`l` | `Locale`: The locale to apply during formatting. If `l` is `null` then no localization is applied.
`format` | `String`: A format string
`args` | `Object`: Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java™ Virtual Machine Specification. The behaviour on a `null` argument depends on the conversion.

Returns
`String` | A formatted string

Throws
`IllegalFormatException` | If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification

See also:

- `Formatter`

### format

    public static String format (String format,
                    Object... args)

Returns a formatted string using the specified format string and arguments.

The locale always used is the one returned by `Locale.getDefault()`.

Parameters
`format` | `String`: A format string
`args` | `Object`: Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java™ Virtual Machine Specification. The behaviour on a `null` argument depends on the conversion.

Returns
`String` | A formatted string

Throws
`IllegalFormatException` | If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the formatter class specification.

See also:

- `Formatter`

### getBytes

    public byte[] getBytes (String charsetName)

Encodes this `String` into a sequence of bytes using the named charset, storing the result into a new byte array.

The behavior of this method when this string cannot be encoded in the given charset is unspecified. The `CharsetEncoder` class should be used when more control over the encoding process is required.

Parameters
`charsetName` | `String`: The name of a supported charset

Returns
`byte[]` | The resultant byte array

Throws
`UnsupportedEncodingException` | If the named charset is not supported

### getBytes

    public byte[] getBytes ()

Encodes this `String` into a sequence of bytes using the platform's default charset, storing the result into a new byte array.

The behavior of this method when this string cannot be encoded in the default charset is unspecified. The `CharsetEncoder` class should be used when more control over the encoding process is required.

Returns
`byte[]` | The resultant byte array

### getBytes

    public byte[] getBytes (Charset charset)

Encodes this `String` into a sequence of bytes using the given charset, storing the result into a new byte array.

This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement byte array. The `CharsetEncoder` class should be used when more control over the encoding process is required.

Parameters
`charset` | `Charset`: The Charset to be used to encode the `String`

Returns
`byte[]` | The resultant byte array

### getBytes

    public void getBytes (int srcBegin,
                    int srcEnd,
                    byte[] dst,
                    int dstBegin)

This method is deprecated.
This method does not properly convert characters into bytes. As of JDK 1.1, the preferred way to do this is via the `getBytes()` method, which uses the platform's default charset.

Copies characters from this string into the destination byte array. Each byte receives the 8 low-order bits of the corresponding character. The eight high-order bits of each character are not copied and do not participate in the transfer in any way.

The first character to be copied is at index `srcBegin`; the last character to be copied is at index `srcEnd-1`. The total number of characters to be copied is `srcEnd-srcBegin`. The characters, converted to bytes, are copied into the subarray of `dst` starting at index `dstBegin` and ending at index:

>          dstBegin + (srcEnd-srcBegin) - 1

Parameters
`srcBegin` | `int`: Index of the first character in the string to copy
`srcEnd` | `int`: Index after the last character in the string to copy
`dst` | `byte`: The destination array
`dstBegin` | `int`: The start offset in the destination array

Throws
`IndexOutOfBoundsException` | If any of the following is true: `srcBegin` is negative `srcBegin` is greater than `srcEnd` `srcEnd` is greater than the length of this String `dstBegin` is negative `dstBegin+(srcEnd-srcBegin)` is larger than `dst.length`

### getChars

    public void getChars (int srcBegin,
                    int srcEnd,
                    char[] dst,
                    int dstBegin)

Copies characters from this string into the destination character array.

The first character to be copied is at index `srcBegin`; the last character to be copied is at index `srcEnd-1` (thus the total number of characters to be copied is `srcEnd-srcBegin`). The characters are copied into the subarray of `dst` starting at index `dstBegin` and ending at index:

>          dstBegin + (srcEnd-srcBegin) - 1

Parameters
`srcBegin` | `int`: index of the first character in the string to copy.
`srcEnd` | `int`: index after the last character in the string to copy.
`dst` | `char`: the destination array.
`dstBegin` | `int`: the start offset in the destination array.

Throws
`IndexOutOfBoundsException` | If any of the following is true: `srcBegin` is negative. `srcBegin` is greater than `srcEnd` `srcEnd` is greater than the length of this string `dstBegin` is negative `dstBegin+(srcEnd-srcBegin)` is larger than `dst.length`

### hashCode

    public int hashCode ()

Returns a hash code for this string. The hash code for a `String` object is computed as

>      s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]

using `int` arithmetic, where `s[i]` is the ith character of the string, `n` is the length of the string, and `^` indicates exponentiation. (The hash value of the empty string is zero.)

Returns
`int` | a hash code value for this object.

### indexOf

    public int indexOf (int ch,
                    int fromIndex)

Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.

If a character with value `ch` occurs in the character sequence represented by this `String` object at an index no smaller than `fromIndex`, then the index of the first such occurrence is returned. For values of `ch` in the range from 0 to 0xFFFF (inclusive), this is the smallest value k such that:

>      (this.charAt(k) == ch) && (k >= fromIndex)

is true. For other values of `ch`, it is the smallest value k such that:

>      (this.codePointAt(k) == ch) && (k >= fromIndex)

is true. In either case, if no such character occurs in this string at or after position `fromIndex`, then `-1` is returned.

There is no restriction on the value of `fromIndex`. If it is negative, it has the same effect as if it were zero: this entire string may be searched. If it is greater than the length of this string, it has the same effect as if it were equal to the length of this string: `-1` is returned.

All indices are specified in `char` values (Unicode code units).

Parameters
`ch` | `int`: a character (Unicode code point).
`fromIndex` | `int`: the index to start the search from.

Returns
`int` | the index of the first occurrence of the character in the character sequence represented by this object that is greater than or equal to `fromIndex`, or `-1` if the character does not occur.

### indexOf

    public int indexOf (String str)

Returns the index within this string of the first occurrence of the specified substring.

The returned index is the smallest value k for which:

>      this.startsWith(str, k)

If no such value of k exists, then `-1` is returned.

Parameters
`str` | `String`: the substring to search for.

Returns
`int` | the index of the first occurrence of the specified substring, or `-1` if there is no such occurrence.

### indexOf

    public int indexOf (int ch)

Returns the index within this string of the first occurrence of the specified character. If a character with value `ch` occurs in the character sequence represented by this `String` object, then the index (in Unicode code units) of the first such occurrence is returned. For values of `ch` in the range from 0 to 0xFFFF (inclusive), this is the smallest value k such that:

>      this.charAt(k) == ch

is true. For other values of `ch`, it is the smallest value k such that:

>      this.codePointAt(k) == ch

is true. In either case, if no such character occurs in this string, then `-1` is returned.

Parameters
`ch` | `int`: a character (Unicode code point).

Returns
`int` | the index of the first occurrence of the character in the character sequence represented by this object, or `-1` if the character does not occur.

### indexOf

    public int indexOf (String str,
                    int fromIndex)

Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.

The returned index is the smallest value k for which:

>      k >= fromIndex && this.startsWith(str, k)

If no such value of k exists, then `-1` is returned.

Parameters
`str` | `String`: the substring to search for.
`fromIndex` | `int`: the index from which to start the search.

Returns
`int` | the index of the first occurrence of the specified substring, starting at the specified index, or `-1` if there is no such occurrence.

### intern

    public String intern ()

Returns a canonical representation for the string object.

A pool of strings, initially empty, is maintained privately by the class `String`.

When the intern method is invoked, if the pool already contains a string equal to this `String` object as determined by the `equals(java.lang.Object)` method, then the string from the pool is returned. Otherwise, this `String` object is added to the pool and a reference to this `String` object is returned.

It follows that for any two strings `s` and `t`, `s.intern() == t.intern()` is `true` if and only if `s.equals(t)` is `true`.

All literal strings and string-valued constant expressions are interned. String literals are defined in section 3.10.5 of the The Java™ Language Specification.

Returns
`String` | a string that has the same contents as this string, but is guaranteed to be from a pool of unique strings.

### isEmpty

    public boolean isEmpty ()

Returns `true` if, and only if, `length()` is `0`.

Returns
`boolean` | `true` if `length()` is `0`, otherwise `false`

### join

    public static String join (CharSequence delimiter,
                    CharSequence... elements)

Returns a new String composed of copies of the `CharSequence elements` joined together with a copy of the specified `delimiter`.

> For example,

>     String message = String.join("-", "Java", "is", "cool");
>          // message returned is: "Java-is-cool"

Note that if an element is null, then `"null"` is added.

Parameters
`delimiter` | `CharSequence`: the delimiter that separates each element
`elements` | `CharSequence`: the elements to join together.

Returns
`String` | a new `String` that is composed of the `elements` separated by the `delimiter`

Throws
`NullPointerException` | If `delimiter` or `elements` is `null`

See also:

- `StringJoiner`

### join

    public static String join (CharSequence delimiter,
                    Iterable<? extends CharSequence> elements)

Returns a new `String` composed of copies of the `CharSequence elements` joined together with a copy of the specified `delimiter`.

> For example,

>     List<String> strings = new LinkedList<>();
>          strings.add("Java");strings.add("is");
>          strings.add("cool");
>          String message = String.join(" ", strings);
>          //message returned is: "Java is cool"

>          Set<String> strings = new LinkedHashSet<>();
>          strings.add("Java"); strings.add("is");
>          strings.add("very"); strings.add("cool");
>          String message = String.join("-", strings);
>          //message returned is: "Java-is-very-cool"

Note that if an individual element is `null`, then `"null"` is added.

Parameters
`delimiter` | `CharSequence`: a sequence of characters that is used to separate each of the `elements` in the resulting `String`
`elements` | `Iterable`: an `Iterable` that will have its `elements` joined together.

Returns
`String` | a new `String` that is composed from the `elements` argument

Throws
`NullPointerException` | If `delimiter` or `elements` is `null`

See also:

- `join(CharSequence, CharSequence)`
- `StringJoiner`

### lastIndexOf

    public int lastIndexOf (int ch)

Returns the index within this string of the last occurrence of the specified character. For values of `ch` in the range from 0 to 0xFFFF (inclusive), the index (in Unicode code units) returned is the largest value k such that:

>      this.charAt(k) == ch

is true. For other values of `ch`, it is the largest value k such that:

>      this.codePointAt(k) == ch

is true. In either case, if no such character occurs in this string, then `-1` is returned. The `String` is searched backwards starting at the last character.

Parameters
`ch` | `int`: a character (Unicode code point).

Returns
`int` | the index of the last occurrence of the character in the character sequence represented by this object, or `-1` if the character does not occur.

### lastIndexOf

    public int lastIndexOf (String str,
                    int fromIndex)

Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index.

The returned index is the largest value k for which:

>      k <= fromIndex && this.startsWith(str, k)

If no such value of k exists, then `-1` is returned.

Parameters
`str` | `String`: the substring to search for.
`fromIndex` | `int`: the index to start the search from.

Returns
`int` | the index of the last occurrence of the specified substring, searching backward from the specified index, or `-1` if there is no such occurrence.

### lastIndexOf

    public int lastIndexOf (String str)

Returns the index within this string of the last occurrence of the specified substring. The last occurrence of the empty string "" is considered to occur at the index value `this.length()`.

The returned index is the largest value k for which:

>      this.startsWith(str, k)

If no such value of k exists, then `-1` is returned.

Parameters
`str` | `String`: the substring to search for.

Returns
`int` | the index of the last occurrence of the specified substring, or `-1` if there is no such occurrence.

### lastIndexOf

    public int lastIndexOf (int ch,
                    int fromIndex)

Returns the index within this string of the last occurrence of the specified character, searching backward starting at the specified index. For values of `ch` in the range from 0 to 0xFFFF (inclusive), the index returned is the largest value k such that:

>      (this.charAt(k) == ch) && (k <= fromIndex)

is true. For other values of `ch`, it is the largest value k such that:

>      (this.codePointAt(k) == ch) && (k <= fromIndex)

is true. In either case, if no such character occurs in this string at or before position `fromIndex`, then `-1` is returned.

All indices are specified in `char` values (Unicode code units).

Parameters
`ch` | `int`: a character (Unicode code point).
`fromIndex` | `int`: the index to start the search from. There is no restriction on the value of `fromIndex`. If it is greater than or equal to the length of this string, it has the same effect as if it were equal to one less than the length of this string: this entire string may be searched. If it is negative, it has the same effect as if it were -1: -1 is returned.

Returns
`int` | the index of the last occurrence of the character in the character sequence represented by this object that is less than or equal to `fromIndex`, or `-1` if the character does not occur before that point.

### length

    public int length ()

Returns the length of this string. The length is equal to the number of Unicode code units in the string.

Returns
`int` | the length of the sequence of characters represented by this object.

### matches

    public boolean matches (String regex)

Tells whether or not this string matches the given regular expression.

An invocation of this method of the form str`.matches(`regex`)` yields exactly the same result as the expression

> `Pattern`.`matches(regex, str)`

Parameters
`regex` | `String`: the regular expression to which this string is to be matched

Returns
`boolean` | `true` if, and only if, this string matches the given regular expression

Throws
`PatternSyntaxException` | if the regular expression's syntax is invalid

See also:

- `Pattern`

### offsetByCodePoints

    public int offsetByCodePoints (int index,
                    int codePointOffset)

Returns the index within this `String` that is offset from the given `index` by `codePointOffset` code points. Unpaired surrogates within the text range given by `index` and `codePointOffset` count as one code point each.

Parameters
`index` | `int`: the index to be offset
`codePointOffset` | `int`: the offset in code points

Returns
`int` | the index within this `String`

Throws
`IndexOutOfBoundsException` | if `index` is negative or larger then the length of this `String`, or if `codePointOffset` is positive and the substring starting with `index` has fewer than `codePointOffset` code points, or if `codePointOffset` is negative and the substring before `index` has fewer than the absolute value of `codePointOffset` code points.

### regionMatches

    public boolean regionMatches (boolean ignoreCase,
                    int toffset,
                    String other,
                    int ooffset,
                    int len)

Tests if two string regions are equal.

A substring of this `String` object is compared to a substring of the argument `other`. The result is `true` if these substrings represent character sequences that are the same, ignoring case if and only if `ignoreCase` is true. The substring of this `String` object to be compared begins at index `toffset` and has length `len`. The substring of `other` to be compared begins at index `ooffset` and has length `len`. The result is `false` if and only if at least one of the following is true:

- `toffset` is negative.
- `ooffset` is negative.
- `toffset+len` is greater than the length of this `String` object.
- `ooffset+len` is greater than the length of the other argument.
- `ignoreCase` is `false` and there is some nonnegative integer k less than `len` such that:

  >      this.charAt(toffset+k) != other.charAt(ooffset+k)

- `ignoreCase` is `true` and there is some nonnegative integer k less than `len` such that:

  >      Character.toLowerCase(this.charAt(toffset+k)) !=
  >      Character.toLowerCase(other.charAt(ooffset+k))

  and:

  >      Character.toUpperCase(this.charAt(toffset+k)) !=
  >              Character.toUpperCase(other.charAt(ooffset+k))

Parameters
`ignoreCase` | `boolean`: if `true`, ignore case when comparing characters.
`toffset` | `int`: the starting offset of the subregion in this string.
`other` | `String`: the string argument.
`ooffset` | `int`: the starting offset of the subregion in the string argument.
`len` | `int`: the number of characters to compare.

Returns
`boolean` | `true` if the specified subregion of this string matches the specified subregion of the string argument; `false` otherwise. Whether the matching is exact or case insensitive depends on the `ignoreCase` argument.

### regionMatches

    public boolean regionMatches (int toffset,
                    String other,
                    int ooffset,
                    int len)

Tests if two string regions are equal.

A substring of this `String` object is compared to a substring of the argument other. The result is true if these substrings represent identical character sequences. The substring of this `String` object to be compared begins at index `toffset` and has length `len`. The substring of other to be compared begins at index `ooffset` and has length `len`. The result is `false` if and only if at least one of the following is true:

- `toffset` is negative.
- `ooffset` is negative.
- `toffset+len` is greater than the length of this `String` object.
- `ooffset+len` is greater than the length of the other argument.
- There is some nonnegative integer k less than `len` such that: `this.charAt(toffset +` k`) != other.charAt(ooffset +` k`)`

Parameters
`toffset` | `int`: the starting offset of the subregion in this string.
`other` | `String`: the string argument.
`ooffset` | `int`: the starting offset of the subregion in the string argument.
`len` | `int`: the number of characters to compare.

Returns
`boolean` | `true` if the specified subregion of this string exactly matches the specified subregion of the string argument; `false` otherwise.

### replace

    public String replace (CharSequence target,
                    CharSequence replacement)

Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence. The replacement proceeds from the beginning of the string to the end, for example, replacing "aa" with "b" in the string "aaa" will result in "ba" rather than "ab".

Parameters
`target` | `CharSequence`: The sequence of char values to be replaced
`replacement` | `CharSequence`: The replacement sequence of char values

Returns
`String` | The resulting string

### replace

    public String replace (char oldChar,
                    char newChar)

Returns a string resulting from replacing all occurrences of `oldChar` in this string with `newChar`.

If the character `oldChar` does not occur in the character sequence represented by this `String` object, then a reference to this `String` object is returned. Otherwise, a `String` object is returned that represents a character sequence identical to the character sequence represented by this `String` object, except that every occurrence of `oldChar` is replaced by an occurrence of `newChar`.

Examples:

>      "mesquite in your cellar".replace('e', 'o')
>              returns "mosquito in your collar"
>      "the war of baronets".replace('r', 'y')
>              returns "the way of bayonets"
>      "sparring with a purple porpoise".replace('p', 't')
>              returns "starring with a turtle tortoise"
>      "JonL".replace('q', 'x') returns "JonL" (no change)

Parameters
`oldChar` | `char`: the old character.
`newChar` | `char`: the new character.

Returns
`String` | a string derived from this string by replacing every occurrence of `oldChar` with `newChar`.

### replaceAll

    public String replaceAll (String regex,
                    String replacement)

Replaces each substring of this string that matches the given regular expression with the given replacement.

An invocation of this method of the form str`.replaceAll(`regex`,` repl`)` yields exactly the same result as the expression

> ``Pattern`.`compile`(regex).`matcher`(str).`replaceAll`(repl)`

Note that backslashes (`\`) and dollar signs (`$`) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string; see `Matcher.replaceAll`. Use `Matcher.quoteReplacement(String)` to suppress the special meaning of these characters, if desired.

Parameters
`regex` | `String`: the regular expression to which this string is to be matched
`replacement` | `String`: the string to be substituted for each match

Returns
`String` | The resulting `String`

Throws
`PatternSyntaxException` | if the regular expression's syntax is invalid

See also:

- `Pattern`

### replaceFirst

    public String replaceFirst (String regex,
                    String replacement)

Replaces the first substring of this string that matches the given regular expression with the given replacement.

An invocation of this method of the form str`.replaceFirst(`regex`,` repl`)` yields exactly the same result as the expression

> ``Pattern`.`compile`(regex).`matcher`(str).`replaceFirst`(repl)`

Note that backslashes (`\`) and dollar signs (`$`) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string; see `Matcher.replaceFirst(String)`. Use `Matcher.quoteReplacement(String)` to suppress the special meaning of these characters, if desired.

Parameters
`regex` | `String`: the regular expression to which this string is to be matched
`replacement` | `String`: the string to be substituted for the first match

Returns
`String` | The resulting `String`

Throws
`PatternSyntaxException` | if the regular expression's syntax is invalid

See also:

- `Pattern`

### split

    public String[] split (String regex,
                    int limit)

Splits this string around matches of the given regular expression.

The array returned by this method contains each substring of this string that is terminated by another substring that matches the given expression or is terminated by the end of the string. The substrings in the array are in the order in which they occur in this string. If the expression does not match any part of the input then the resulting array has just one element, namely this string.

When there is a positive-width match at the beginning of this string then an empty leading substring is included at the beginning of the resulting array. A zero-width match at the beginning however never produces such empty leading substring.

The `limit` parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.

The string `"boo:and:foo"`, for example, yields the following results with these parameters:

> Regex | Limit | Result
> --- | --- | ---
> : | 2 | `{ "boo", "and:foo" }`
> : | 5 | `{ "boo", "and", "foo" }`
> : | -2 | `{ "boo", "and", "foo" }`
> o | 5 | `{ "b", "", ":and:f", "", "" }`
> o | -2 | `{ "b", "", ":and:f", "", "" }`
> o | 0 | `{ "b", "", ":and:f" }`

An invocation of this method of the form str.`split(`regex`,` n`)` yields the same result as the expression

> ``Pattern`.`compile`(regex).`split`(str, n)`

Parameters
`regex` | `String`: the delimiting regular expression
`limit` | `int`: the result threshold, as described above

Returns
`String[]` | the array of strings computed by splitting this string around matches of the given regular expression

Throws
`PatternSyntaxException` | if the regular expression's syntax is invalid

See also:

- `Pattern`

### split

    public String[] split (String regex)

Splits this string around matches of the given regular expression.

This method works as if by invoking the two-argument `split` method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.

The string `"boo:and:foo"`, for example, yields the following results with these expressions:

> Regex | Result
> --- | ---
> : | `{ "boo", "and", "foo" }`
> o | `{ "b", "", ":and:f" }`

Parameters
`regex` | `String`: the delimiting regular expression

Returns
`String[]` | the array of strings computed by splitting this string around matches of the given regular expression

Throws
`PatternSyntaxException` | if the regular expression's syntax is invalid

See also:

- `Pattern`

### startsWith

    public boolean startsWith (String prefix)

Tests if this string starts with the specified prefix.

Parameters
`prefix` | `String`: the prefix.

Returns
`boolean` | `true` if the character sequence represented by the argument is a prefix of the character sequence represented by this string; `false` otherwise. Note also that `true` will be returned if the argument is an empty string or is equal to this `String` object as determined by the `equals(java.lang.Object)` method.

### startsWith

    public boolean startsWith (String prefix,
                    int toffset)

Tests if the substring of this string beginning at the specified index starts with the specified prefix.

Parameters
`prefix` | `String`: the prefix.
`toffset` | `int`: where to begin looking in this string.

Returns
`boolean` | `true` if the character sequence represented by the argument is a prefix of the substring of this object starting at index `toffset`; `false` otherwise. The result is `false` if `toffset` is negative or greater than the length of this `String` object; otherwise the result is the same as the result of the expression
              this.substring(toffset).startsWith(prefix)

### subSequence

    public CharSequence subSequence (int beginIndex,
                    int endIndex)

Returns a character sequence that is a subsequence of this sequence.

An invocation of this method of the form

>      str.subSequence(begin, end)

behaves in exactly the same way as the invocation

>      str.substring(begin, end)

##### API Note:

- This method is defined so that the `String` class can implement the `CharSequence` interface.

Parameters
`beginIndex` | `int`: the begin index, inclusive.
`endIndex` | `int`: the end index, exclusive.

Returns
`CharSequence` | the specified subsequence.

Throws
`IndexOutOfBoundsException` | if `beginIndex` or `endIndex` is negative, if `endIndex` is greater than `length()`, or if `beginIndex` is greater than `endIndex`

### substring

    public String substring (int beginIndex,
                    int endIndex)

Returns a string that is a substring of this string. The substring begins at the specified `beginIndex` and extends to the character at index `endIndex - 1`. Thus the length of the substring is `endIndex-beginIndex`.

Examples:

>      "hamburger".substring(4, 8) returns "urge"
>      "smiles".substring(1, 5) returns "mile"

Parameters
`beginIndex` | `int`: the beginning index, inclusive.
`endIndex` | `int`: the ending index, exclusive.

Returns
`String` | the specified substring.

Throws
`IndexOutOfBoundsException` | if the `beginIndex` is negative, or `endIndex` is larger than the length of this `String` object, or `beginIndex` is larger than `endIndex`.

### substring

    public String substring (int beginIndex)

Returns a string that is a substring of this string. The substring begins with the character at the specified index and extends to the end of this string.

Examples:

>      "unhappy".substring(2) returns "happy"
>      "Harbison".substring(3) returns "bison"
>      "emptiness".substring(9) returns "" (an empty string)

Parameters
`beginIndex` | `int`: the beginning index, inclusive.

Returns
`String` | the specified substring.

Throws
`IndexOutOfBoundsException` | if `beginIndex` is negative or larger than the length of this `String` object.

### toCharArray

    public char[] toCharArray ()

Converts this string to a new character array.

Returns
`char[]` | a newly allocated character array whose length is the length of this string and whose contents are initialized to contain the character sequence represented by this string.

### toLowerCase

    public String toLowerCase ()

Converts all of the characters in this `String` to lower case using the rules of the default locale. This is equivalent to calling `toLowerCase(Locale.getDefault())`.

Note: This method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently. Examples are programming language identifiers, protocol keys, and HTML tags. For instance, `"TITLE".toLowerCase()` in a Turkish locale returns `"t\u0131tle"`, where '\u0131' is the LATIN SMALL LETTER DOTLESS I character. To obtain correct results for locale insensitive strings, use `toLowerCase(Locale.ROOT)`.

Returns
`String` | the `String`, converted to lowercase.

See also:

- `toLowerCase(Locale)`

### toLowerCase

    public String toLowerCase (Locale locale)

Converts all of the characters in this `String` to lower case using the rules of the given `Locale`. Case mapping is based on the Unicode Standard version specified by the `Character` class. Since case mappings are not always 1:1 char mappings, the resulting `String` may be a different length than the original `String`.

Examples of lowercase mappings are in the following table:

Language Code of Locale | Upper Case | Lower Case | Description
--- | --- | --- | ---
tr (Turkish) | \u0130 | \u0069 | capital letter I with dot above -> small letter i
tr (Turkish) | \u0049 | \u0131 | capital letter I -> small letter dotless i
(all) | French Fries | french fries | lowercased all chars in String
(all) |  |  | lowercased all chars in String

Parameters
`locale` | `Locale`: use the case transformation rules for this locale

Returns
`String` | the `String`, converted to lowercase.

See also:

- `toLowerCase()`
- `toUpperCase()`
- `toUpperCase(Locale)`

### toString

    public String toString ()

This object (which is already a string!) is itself returned.

Returns
`String` | the string itself.

### toUpperCase

    public String toUpperCase (Locale locale)

Converts all of the characters in this `String` to upper case using the rules of the given `Locale`. Case mapping is based on the Unicode Standard version specified by the `Character` class. Since case mappings are not always 1:1 char mappings, the resulting `String` may be a different length than the original `String`.

Examples of locale-sensitive and 1:M case mappings are in the following table.

Language Code of Locale | Lower Case | Upper Case | Description
--- | --- | --- | ---
tr (Turkish) | \u0069 | \u0130 | small letter i -> capital letter I with dot above
tr (Turkish) | \u0131 | \u0049 | small letter dotless i -> capital letter I
(all) | \u00df | \u0053 \u0053 | small letter sharp s -> two letters: SS
(all) | Fahrvergnügen | FAHRVERGNÜGEN |

Parameters
`locale` | `Locale`: use the case transformation rules for this locale

Returns
`String` | the `String`, converted to uppercase.

See also:

- `toUpperCase()`
- `toLowerCase()`
- `toLowerCase(Locale)`

### toUpperCase

    public String toUpperCase ()

Converts all of the characters in this `String` to upper case using the rules of the default locale. This method is equivalent to `toUpperCase(Locale.getDefault())`.

Note: This method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently. Examples are programming language identifiers, protocol keys, and HTML tags. For instance, `"title".toUpperCase()` in a Turkish locale returns `"T\u0130TLE"`, where '\u0130' is the LATIN CAPITAL LETTER I WITH DOT ABOVE character. To obtain correct results for locale insensitive strings, use `toUpperCase(Locale.ROOT)`.

Returns
`String` | the `String`, converted to uppercase.

See also:

- `toUpperCase(Locale)`

### trim

    public String trim ()

Returns a string whose value is this string, with any leading and trailing whitespace removed.

If this `String` object represents an empty character sequence, or the first and last characters of character sequence represented by this `String` object both have codes greater than `'\u0020'` (the space character), then a reference to this `String` object is returned.

Otherwise, if there is no character with a code greater than `'\u0020'` in the string, then a `String` object representing an empty string is returned.

Otherwise, let k be the index of the first character in the string whose code is greater than `'\u0020'`, and let m be the index of the last character in the string whose code is greater than `'\u0020'`. A `String` object is returned, representing the substring of this string that begins with the character at index k and ends with the character at index m-that is, the result of `this.substring(k, m + 1)`.

This method may be used to trim whitespace (as defined above) from the beginning and end of a string.

Returns
`String` | A string whose value is this string, with any leading and trailing white space removed, or this string if it has no leading or trailing white space.

### valueOf

    public static String valueOf (boolean b)

Returns the string representation of the `boolean` argument.

Parameters
`b` | `boolean`: a `boolean`.

Returns
`String` | if the argument is `true`, a string equal to `"true"` is returned; otherwise, a string equal to `"false"` is returned.

### valueOf

    public static String valueOf (double d)

Returns the string representation of the `double` argument.

The representation is exactly the one returned by the `Double.toString` method of one argument.

Parameters
`d` | `double`: a `double`.

Returns
`String` | a string representation of the `double` argument.

See also:

- `Double.toString(double)`

### valueOf

    public static String valueOf (char[] data,
                    int offset,
                    int count)

Returns the string representation of a specific subarray of the `char` array argument.

The `offset` argument is the index of the first character of the subarray. The `count` argument specifies the length of the subarray. The contents of the subarray are copied; subsequent modification of the character array does not affect the returned string.

Parameters
`data` | `char`: the character array.
`offset` | `int`: initial offset of the subarray.
`count` | `int`: length of the subarray.

Returns
`String` | a `String` that contains the characters of the specified subarray of the character array.

Throws
`IndexOutOfBoundsException` | if `offset` is negative, or `count` is negative, or `offset+count` is larger than `data.length`.

### valueOf

    public static String valueOf (float f)

Returns the string representation of the `float` argument.

The representation is exactly the one returned by the `Float.toString` method of one argument.

Parameters
`f` | `float`: a `float`.

Returns
`String` | a string representation of the `float` argument.

See also:

- `Float.toString(float)`

### valueOf

    public static String valueOf (int i)

Returns the string representation of the `int` argument.

The representation is exactly the one returned by the `Integer.toString` method of one argument.

Parameters
`i` | `int`: an `int`.

Returns
`String` | a string representation of the `int` argument.

See also:

- `Integer.toString(int, int)`

### valueOf

    public static String valueOf (char c)

Returns the string representation of the `char` argument.

Parameters
`c` | `char`: a `char`.

Returns
`String` | a string of length `1` containing as its single character the argument `c`.

### valueOf

    public static String valueOf (long l)

Returns the string representation of the `long` argument.

The representation is exactly the one returned by the `Long.toString` method of one argument.

Parameters
`l` | `long`: a `long`.

Returns
`String` | a string representation of the `long` argument.

See also:

- `Long.toString(long)`

### valueOf

    public static String valueOf (Object obj)

Returns the string representation of the `Object` argument.

Parameters
`obj` | `Object`: an `Object`.

Returns
`String` | if the argument is `null`, then a string equal to `"null"`; otherwise, the value of `obj.toString()` is returned.

See also:

- `Object.toString()`

### valueOf

    public static String valueOf (char[] data)

Returns the string representation of the `char` array argument. The contents of the character array are copied; subsequent modification of the character array does not affect the returned string.

Parameters
`data` | `char`: the character array.

Returns
`String` | a `String` that contains the characters of the character array.

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