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

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java.io
Class CharArrayReader

java.lang.Object
  |
  +--java.io.Reader
        |
        +--java.io.CharArrayReader
public class CharArrayReader
extends Reader

This class implements a character buffer that can be used as a character-input stream.

Since:
JDK1.1

Field Summary
protected  char[] buf
          Character buffer
protected  int count
          Number of valid characters in buffer
protected  int markedPos
          Position of mark in buffer
protected  int pos
          Current buffer position
 
Fields inherited from class java.io.Reader
lock
 
Constructor Summary
CharArrayReader(char[] buf)
          Create an CharArrayReader from the specified array of chars.
CharArrayReader(char[] buf, int offset, int length)
          Create an CharArrayReader from the specified array of chars.
 
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[] b, 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 if it has never been marked.
 long skip(long n)
          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
 

Field Detail

buf

protected char[] buf
Character buffer

pos

protected int pos
Current buffer position

markedPos

protected int markedPos
Position of mark in buffer

count

protected int count
Number of valid characters in buffer
Constructor Detail

CharArrayReader

public CharArrayReader(char[] buf)
Create an CharArrayReader from the specified array of chars.
Parameters:
buf - Input buffer (not copied)

CharArrayReader

public CharArrayReader(char[] buf,
                       int offset,
                       int length)
Create an CharArrayReader from the specified array of chars.
Parameters:
buf - Input buffer (not copied)
offset - Offset of the first char to read
length - Number of chars to read
Method Detail

read

public int read()
         throws IOException
Read a single character.
Overrides:
read in class Reader
Throws:
IOException - If an I/O error occurs

read

public int read(char[] b,
                int off,
                int len)
         throws IOException
Read characters into a portion of an array.
Overrides:
read in class Reader
Parameters:
b - Destination buffer
off - Offset at which to start storing characters
len - Maximum number of characters to read
Returns:
The actual number of characters read, or -1 if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs

skip

public long skip(long n)
          throws IOException
Skip characters.
Overrides:
skip in class Reader
Parameters:
n - The number of characters to skip
Returns:
The number of characters actually skipped
Throws:
IOException - If an I/O error occurs

ready

public boolean ready()
              throws IOException
Tell whether this stream is ready to be read. Character-array readers are always ready to be read.
Overrides:
ready in class Reader
Throws:
IOException - If an I/O error occurs

markSupported

public boolean markSupported()
Tell whether this stream supports the mark() operation, which it does.
Overrides:
markSupported in class Reader

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 character array, there is no actual limit; hence this argument is ignored.
Throws:
IOException - If an I/O error occurs

reset

public void reset()
           throws IOException
Reset the stream to the most recent mark, or to the beginning if it has never been marked.
Overrides:
reset in class Reader
Throws:
IOException - If an I/O error occurs

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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