java.lang.Object
- java.io.Reader
- - java.io.FilterReader
  - - java.io.PushbackReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable
```
public class PushbackReader
extends FilterReader
```
A character-stream reader that allows characters to be pushed back into the stream.

Since:

JDK1.1

Field Summary
- Fields inherited from class java.io.FilterReader in
- Fields inherited from class java.io.Reader lock

Constructor Summary

Constructors
Constructor and Description
`PushbackReader(Reader in)` Creates a new pushback reader with a one-character pushback buffer.
`PushbackReader(Reader in, int size)` Creates a new pushback reader with a pushback buffer of the given size.

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Method Summary

Methods
Modifier and Type	Method and Description
`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, which it does not.
`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.
`void`	`unread(char[] cbuf)` Pushes back an array of characters by copying it to the front of the pushback buffer.
`void`	`unread(char[] cbuf, int off, int len)` Pushes back a portion of an array of characters by copying it to the front of the pushback buffer.
`void`	`unread(int c)` Pushes back a single character by copying it to the front of the pushback buffer.

Erste Seite von API Java Inhaltsverzeichnis Haut

Methods inherited from class java.io.Reader read, read

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PushbackReader
    public PushbackReader(Reader in, int size)
    
    Creates a new pushback reader with a pushback buffer of the given size.
    
    Parameters:
    in - The reader from which characters will be read
    size - The size of the pushback buffer
    
    Throws:
    
    IllegalArgumentException - if size is <= 0
  - PushbackReader
    public PushbackReader(Reader in)
    
    Creates a new pushback reader with a one-character pushback buffer.
    
    Parameters:
    in - The reader from which characters will be read
- Method Detail
  - read
    public int read() throws IOException
    
    Reads a single character.
    
    Overrides:
    
    read in class FilterReader
    
    Returns:
    The character read, 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) throws IOException
    
    Reads characters into a portion of an array.
    
    Overrides:
    
    read in class FilterReader
    
    Parameters:
    cbuf - Destination buffer
    off - Offset at which to start writing characters
    len - Maximum number of characters to read
    
    Returns:
    The number of characters read, or -1 if the end of the stream has been reached
    
    Throws:
    
    IOException - If an I/O error occurs
  - unread
    public void unread(int c) throws IOException
    
    Pushes back a single character by copying it to the front of the pushback buffer. After this method returns, the next character to be read will have the value (char)c.
    
    Parameters:
    c - The int value representing a character to be pushed back
    
    Throws:
    
    IOException - If the pushback buffer is full, or if some other I/O error occurs
  - unread
    public void unread(char[] cbuf, int off, int len) throws IOException
    
    Pushes back a portion of an array of characters by copying it to the front of the pushback buffer. After this method returns, the next character to be read will have the value cbuf[off], the character after that will have the value cbuf[off+1], and so forth.
    
    Parameters:
    cbuf - Character array
    off - Offset of first character to push back
    len - Number of characters to push back
    
    Throws:
    
    IOException - If there is insufficient room in the pushback buffer, or if some other I/O error occurs
  - unread
    public void unread(char[] cbuf) throws IOException
    
    Pushes back an array of characters by copying it to the front of the pushback buffer. After this method returns, the next character to be read will have the value cbuf[0], the character after that will have the value cbuf[1], and so forth.
    
    Parameters:
    cbuf - Character array to push back
    
    Throws:
    
    IOException - If there is insufficient room in the pushback buffer, or if some other I/O error occurs
  - ready
    public boolean ready() throws IOException
    
    Tells whether this stream is ready to be read.
    
    Overrides:
    
    ready in class FilterReader
    
    Returns:
    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
  - mark
    public void mark(int readAheadLimit) throws IOException
    
    Marks the present position in the stream. The mark for class PushbackReader always throws an exception.
    
    Overrides:
    
    mark in class FilterReader
    
    Parameters:
    readAheadLimit - 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 - Always, since mark is not supported
  - reset
    public void reset() throws IOException
    
    Resets the stream. The reset method of PushbackReader always throws an exception.
    
    Overrides:
    
    reset in class FilterReader
    
    Throws:
    
    IOException - Always, since reset is not supported
  - markSupported
    public boolean markSupported()
    
    Tells whether this stream supports the mark() operation, which it does not.
    
    Overrides:
    
    markSupported in class FilterReader
    
    Returns:
    true if and only if this stream supports the mark operation.
  - close
    public void close() throws IOException
    
    Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), unread(), ready(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Overrides:
    
    close in class FilterReader
    
    Throws:
    
    IOException - If an I/O error occurs
  - skip
    public long skip(long n) throws IOException
    
    Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.
    
    Overrides:
    
    skip in class FilterReader
    
    Parameters:
    n - The number of characters to skip
    
    Returns:
    The number of characters actually skipped
    
    Throws:
    
    IllegalArgumentException - If n is negative.
    
    IOException - If an I/O error occurs

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/io/PushbackReader.html

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Class PushbackReader

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