Java.io.PushbackReader Class


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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

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

S.N. 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

S.N. 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


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