程序包 java.io

类 CharArrayReader

java.lang.Object

java.io.Reader

java.io.CharArrayReader

所有已实现的接口:

Closeable, AutoCloseable, Readable

public class CharArrayReader
extends Reader

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

从以下版本开始:

JDK1.1

字段概要

字段

限定符和类型	字段	说明
protected char[]	buf	The character buffer.
protected int	count	The index of the end of this buffer.
protected int	markedPos	The position of mark in buffer.
protected int	pos	The current buffer position.

从类继承的字段 java.io.Reader

lock

构造器概要

构造器

构造器	说明
CharArrayReader(char[] buf)	Creates a CharArrayReader from the specified array of chars.
CharArrayReader(char[] buf, int offset, int length)	Creates a CharArrayReader from the specified array of chars.

方法概要

限定符和类型	方法	说明
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.
int	read()	Reads a single character.
int	read(char[] b, 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 to the most recent mark, or to the beginning if it has never been marked.
long	skip(long n)	Skips characters.

从类继承的方法 java.lang.Object

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

从类继承的方法 java.io.Reader

read, read

字段详细资料

buf

protected char[] buf

The character buffer.

count

protected int count

The index of the end of this buffer. There is not valid data at or beyond this index.

markedPos

protected int markedPos

The position of mark in buffer.

pos

protected int pos

The current buffer position.

构造器详细资料

CharArrayReader

public CharArrayReader(char[] buf)

Creates a CharArrayReader from the specified array of chars.

参数:

buf - Input buffer (not copied)

CharArrayReader

public CharArrayReader(char[] buf,
                       int offset,
                       int length)

Creates a CharArrayReader from the specified array of chars.

The resulting reader will start reading at the given offset. The total number of char values that can be read from this reader will be either length or buf.length-offset, whichever is smaller.

参数:

buf - Input buffer (not copied)

offset - Offset of the first char to read

length - Number of chars to read

抛出:

IllegalArgumentException - If offset is negative or greater than buf.length, or if length is negative, or if the sum of these two values is negative.

方法详细资料

read

public int read()
         throws IOException

Reads a single character.

覆盖:

read 在类中 Reader

返回:

The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached

抛出:

IOException - If an I/O error occurs

read

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

Reads characters into a portion of an array.

指定者:

read 在类中 Reader

参数:

b - Destination buffer

off - Offset at which to start storing characters

len - Maximum number of characters to read

返回:

The actual number of characters read, or -1 if the end of the stream has been reached

抛出:

IOException - If an I/O error occurs

skip

public long skip(long n)
          throws IOException

Skips characters. Returns the number of characters that were skipped.

The n parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. If n is negative, then this method does nothing and returns 0.

覆盖:

skip 在类中 Reader

参数:

n - The number of characters to skip

返回:

The number of characters actually skipped

抛出:

IOException - If the stream is closed, or an I/O error occurs

ready

public boolean ready()
              throws IOException

Tells whether this stream is ready to be read. Character-array readers are always ready to be read.

覆盖:

ready 在类中 Reader

返回:

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.

抛出:

IOException - If an I/O error occurs

markSupported

public boolean markSupported()

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

覆盖:

markSupported 在类中 Reader

返回:

true if and only if this stream supports the mark operation.

mark

public void mark(int readAheadLimit)
          throws IOException

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

覆盖:

mark 在类中 Reader

参数:

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.

抛出:

IOException - If an I/O error occurs

reset

public void reset()
           throws IOException

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

覆盖:

reset 在类中 Reader

抛出:

IOException - If an I/O error occurs

close

public void close()

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 Closeable

指定者:

close 在类中 Reader