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Summary: Fields | Inherited Fields | Protected Ctors | Methods | Inherited Methods

# FilterReader

`public abstract class FilterReader`
`` `extends Reader` ``

java.lang.Object
↳ | java.io.Reader
| ↳ | java.io.FilterReader

Known direct subclasses PushbackReader
PushbackReader | A character-stream reader that allows characters to be pushed back into the stream.

Abstract class for reading filtered character streams. The abstract class `FilterReader` itself provides default methods that pass all requests to the contained stream. Subclasses of `FilterReader` should override some of these methods and may also provide additional methods and fields.

## Summary

### Fields
`protected Reader` | `in` The underlying character-input stream.

### Inherited fields
From class `java.io.Reader`
`protected Object` | `lock` The object used to synchronize operations on this stream.

### Protected constructors
`FilterReader(Reader in)` Creates a new filtered reader.

### Public methods
`void` | `close()` Closes the stream and releases any system resources associated with it.
`void` | `mark(int readAheadLimit)` Marks the present position in the stream.
`boolean` | `markSupported()` Tells whether this stream supports the mark() operation.
`int` | `read()` Reads a single character.
`int` | `read(char[] cbuf, int off, int len)` Reads characters into a portion of an array.
`boolean` | `ready()` Tells whether this stream is ready to be read.
`void` | `reset()` Resets the stream.
`long` | `skip(long n)` Skips characters.

### Inherited methods
From class `java.io.Reader`
`abstract void` | `close()` Closes the stream and releases any system resources associated with it.
`void` | `mark(int readAheadLimit)` Marks the present position in the stream.
`boolean` | `markSupported()` Tells whether this stream supports the mark() operation.
`int` | `read()` Reads a single character.
`abstract int` | `read(char[] cbuf, int off, int len)` Reads characters into a portion of an array.
`int` | `read(char[] cbuf)` Reads characters into an array.
`int` | `read(CharBuffer target)` Attempts to read characters into the specified character buffer.
`boolean` | `ready()` Tells whether this stream is ready to be read.
`void` | `reset()` Resets the stream.
`long` | `skip(long n)` Skips characters.
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.Readable`
`abstract int` | `read(CharBuffer cb)` Attempts to read characters into the specified character buffer.
From interface `java.io.Closeable`
`abstract void` | `close()` Closes this stream and releases any system resources associated with it.
From interface `java.lang.AutoCloseable`
`abstract void` | `close()` Closes this resource, relinquishing any underlying resources.

## Fields

### in

    protected Reader in

The underlying character-input stream.

## Protected constructors

### FilterReader

    protected FilterReader (Reader in)

Creates a new filtered reader.

Parameters
`in` | `Reader`: a Reader object providing the underlying stream.

Throws
`NullPointerException` | if `in` is `null`

## Public methods

### close

    public void close ()

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

Throws
`IOException` |

### mark

    public void mark (int readAheadLimit)

Marks the present position in the stream.

Parameters
`readAheadLimit` | `int`: Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.

Throws
`IOException` | If an I/O error occurs

### markSupported

    public boolean markSupported ()

Tells whether this stream supports the mark() operation.

Returns
`boolean` | true if and only if this stream supports the mark operation.

### read

    public int read ()

Reads a single character.

Returns
`int` | The character read, as an integer in the range 0 to 65535 (`0x00-0xffff`), or -1 if the end of the stream has been reached

Throws
`IOException` | If an I/O error occurs

### read

    public int read (char[] cbuf,
                    int off,
                    int len)

Reads characters into a portion of an array.

Parameters
`cbuf` | `char`: Destination buffer
`off` | `int`: Offset at which to start storing characters
`len` | `int`: Maximum number of characters to read

Returns
`int` | The number of characters read, or -1 if the end of the stream has been reached

Throws
`IOException` | If an I/O error occurs

### ready

    public boolean ready ()

Tells whether this stream is ready to be read.

Returns
`boolean` | True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

Throws
`IOException` | If an I/O error occurs

### reset

    public void reset ()

Resets the stream.

Throws
`IOException` | If an I/O error occurs

### skip

    public long skip (long n)

Skips characters.

Parameters
`n` | `long`: The number of characters to skip

Returns
`long` | The number of characters actually skipped

Throws
`IOException` | If an I/O error occurs

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