File	Doc	Category	Size	Date	Package
Writer.java	API Doc	J2ME CLDC 1.1	5081	Wed Feb 05 15:55:58 GMT 2003	java.io

Writer

• java.lang.Object

Fields Summary
private char[]	writeBuffer Temporary buffer used to hold writes of strings and single characters
private final int	writeBufferSize Size of writeBuffer, must be >= 1
protected Object	lock The object used to synchronize operations on this stream. For efficiency, a character-stream object may use an object other than itself to protect critical sections. A subclass should therefore use the object in this field rather than this or a synchronized method.

Constructors Summary
protected Writer() Create a new character-stream writer whose critical sections will synchronize on the writer itself. this.lock = this;
protected Writer(Object lock) Create a new character-stream writer whose critical sections will synchronize on the given object. param lock Object to synchronize on. if (lock == null) { throw new NullPointerException(); } this.lock = lock;

Methods Summary
public abstract void	close() Close the stream, flushing it first. Once a stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously-closed stream, however, has no effect. exception IOException If an I/O error occurs
public abstract void	flush() Flush the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams. exception IOException If an I/O error occurs
public void	write(int c) Write a single character. The character to be written is contained in the 16 low-order bits of the given integer value; the 16 high-order bits are ignored. Subclasses that intend to support efficient single-character output should override this method. param c int specifying a character to be written. exception IOException If an I/O error occurs synchronized (lock) { if (writeBuffer == null){ writeBuffer = new char[writeBufferSize]; } writeBuffer[0] = (char) c; write(writeBuffer, 0, 1); }
public void	write(char[] cbuf) Write an array of characters. param cbuf Array of characters to be written exception IOException If an I/O error occurs write(cbuf, 0, cbuf.length);
public abstract void	write(char[] cbuf, int off, int len) Write a portion of an array of characters. param cbuf Array of characters param off Offset from which to start writing characters param len Number of characters to write exception IOException If an I/O error occurs
public void	write(java.lang.String str) Write a string. param str String to be written exception IOException If an I/O error occurs write(str, 0, str.length());
public void	write(java.lang.String str, int off, int len) Write a portion of a string. param str A String param off Offset from which to start writing characters param len Number of characters to write exception IOException If an I/O error occurs synchronized (lock) { char cbuf[]; if (len <= writeBufferSize) { if (writeBuffer == null) { writeBuffer = new char[writeBufferSize]; } cbuf = writeBuffer; } else { // Don't permanently allocate very large buffers. cbuf = new char[len]; } str.getChars(off, (off + len), cbuf, 0); write(cbuf, 0, len); }