Class java.io.StringReader - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.io.StringReader

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

public class StringReader
extends Reader

A character stream whose source is a string.

StringReader(String): Create a new string reader.

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

StringReader

 public StringReader(String s)

Create a new string reader.

read

 public int read() throws IOException

Read a single character.

Returns:: The character read, or -1 if the end of the stream has been reached
Throws: IOException: If an I/O error occurs
Overrides:: read in class Reader

read

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

Read characters into a portion of an array.

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
Overrides:: read in class Reader

skip

 public long skip(long ns) throws IOException

Skip characters.

Throws: IOException: If an I/O error occurs
Overrides:: skip in class Reader

ready

 public boolean ready()

Tell whether this stream is ready to be read. String readers are always ready to be read.

Overrides:: ready in class Reader

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.

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 is ignored.
Throws: IOException: If an I/O error occurs
Overrides:: mark in class Reader

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.

Throws: IOException: If an I/O error occurs
Overrides:: reset in class Reader

close

 public void close()

Close the stream.

Overrides:: close in class Reader

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