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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class StringReader - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.io
Class StringReader

java.lang.Object
  |
  +--java.io.Reader
        |
        +--java.io.StringReader

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public class StringReader

extends Reader

A character stream whose source is a string.

Since:

JDK1.1

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Fields inherited from class java.io.Reader

lock

 

Constructor Summary

StringReader(String s)           Create a new string reader.

 

Method Summary
void	close()           Close the stream.
void	mark(int readAheadLimit)           Mark the present position in the stream.
boolean	markSupported()           Tell whether this stream supports the mark() operation, which it does.
int	read()           Read a single character.
int	read(char[] cbuf, int off, int len)           Read characters into a portion of an array.
boolean	ready()           Tell whether this stream is ready to be read.
void	reset()           Reset the stream to the most recent mark, or to the beginning of the string if it has never been marked.
long	skip(long ns)           Skip characters.

 

Methods inherited from class java.io.Reader

read

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

StringReader

public StringReader(String s)

Create a new string reader.

Method Detail

read

public int read()
         throws IOException

Read a single character.

Overrides:

read in class Reader

Returns:

The character read, or -1 if the end of the stream has been reached

Throws:

IOException - If an I/O error occurs

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read

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

Read characters into a portion of an array.

Overrides:

read in class Reader

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

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skip

public long skip(long ns)
          throws IOException

Skip characters.

Overrides:

skip in class Reader

Throws:

IOException - If an I/O error occurs

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ready

public boolean ready()
              throws IOException

Tell whether this stream is ready to be read.

Overrides:

ready in class Reader

Returns:

True if the next read() is guaranteed not to block for input

Throws:

IOException - If the stream is closed

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markSupported

public boolean markSupported()

Tell whether this stream supports the mark() operation, which it does.

Overrides:

markSupported in class Reader

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mark

public void mark(int readAheadLimit)
          throws IOException

Mark the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

Overrides:

mark in class Reader

Parameters:

readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a string, there is no actual limit, so this argument must not be negative, but is otherwise ignored.

Throws:

IllegalArgumentException - If readAheadLimit is < 0

IOException - If an I/O error occurs

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reset

public void reset()
           throws IOException

Reset the stream to the most recent mark, or to the beginning of the string if it has never been marked.

Overrides:

reset in class Reader

Throws:

IOException - If an I/O error occurs

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close

public void close()

Close the stream.

Overrides:

close in class Reader

Tags copied from class: Reader

Throws:

IOException - If an I/O error occurs

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