PushbackReader 

Introduction

The Java.io.PushbackReader class is a character-stream reader that allows characters to be pushed back into the stream.

Class declaration

Following is the declaration for Java.io.PushbackReader class −

public class PushbackReader
   extends FilterReader

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Field

Following are the fields for Java.io.PushbackReader class −

• protected Reader in − This is the character-input stream.
• protected Object lock − This is the object used to synchronize operations on this stream.

Class constructors

Sr.No.	Constructor & Description
1	PushbackReader(Reader in)This creates a new pushback reader with a one-character pushback buffer.
2	PushbackReader(Reader in, int size)This creates a new pushback reader with a pushback buffer of the given size.

Class methods

Sr.No.	Method & Description
1	void close()This method closes the stream and releases any system resources associated with it.
2	void mark(int readAheadLimit)This method marks the present position in the stream.
3	boolean markSupported()This method tells whether this stream supports the mark() operation, which it does not.
4	int read()This method reads a single character.
5	int read(char[] cbuf, int off, int len)This method reads characters into a portion of an array.
6	boolean ready()This method tells whether this stream is ready to be read.
7	void reset()This method resets the stream.
8	long skip(long n)This method skips characters.
9	void unread(char[] cbuf)This method pushes back an array of characters by copying it to the front of the pushback buffer.
10	void unread(char[] cbuf, int off, int len)This method pushes back a portion of an array of characters by copying it to the front of the pushback buffer.
11	void unread(int c)This method pushes back a single character by copying it to the front of the pushback buffer.

Methods inherited

This class inherits methods from the following classes −

• Java.io.Reader
• Java.io.Object