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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