Class Writer

java.lang.Object

java.io.Writer

All Implemented Interfaces:

AutoCloseable

Direct Known Subclasses:

OutputStreamWriter, StringWriter

public abstract class Writer
extends Object
implements AutoCloseable

Abstract class for writing to character streams. The only methods that a subclass must implement are write(char[], int, int), flush(), and close(). Most subclasses, however, will override some of the methods defined here in order to provide higher efficiency, additional functionality, or both. Since: JDK1.1, CLDC 1.0 See Also:OutputStreamWriter, Reader

Field Summary

Fields

Modifier and Type	Field	Description
protected Object	lock	The object used to synchronize operations on this stream.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Writer()	Create a new character-stream writer whose critical sections will synchronize on the writer itself.
protected	Writer(Object lock)	Create a new character-stream writer whose critical sections will synchronize on the given object.

Method Summary

Modifier and Type	Method	Description
abstract void	close()	Close the stream, flushing it first.
abstract void	flush()	Flush the stream.
void	write(char[] cbuf)	Write an array of characters.
abstract void	write(char[] cbuf, int off, int len)	Write a portion of an array of characters.
void	write(int c)	Write a single character.
void	write(String str)	Write a string.
void	write(String str, int off, int len)	Write a portion of a string.

Methods inherited from class Object

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

Modifier and Type	Method	Description
protected Object	clone()
boolean	equals(Object obj)	Indicates whether some other object is "equal to" this one.
final Class	getClass()	Returns the runtime class of an object.
int	hashCode()	Returns a hash code value for the object.
final void	notify()	Wakes up a single thread that is waiting on this object's monitor.
final void	notifyAll()	Wakes up all threads that are waiting on this object's monitor.
String	toString()	Returns a string representation of the object.
final void	wait()	Causes current thread to wait until another thread invokes the method or the method for this object.
final void	wait(long timeout)	Causes current thread to wait until either another thread invokes the method or the method for this object, or a specified amount of time has elapsed.
final void	wait(long timeout, int nanos)	Causes current thread to wait until another thread invokes the method or the method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.

Field Details

lock

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.

Constructor Details

Writer

protected Writer()

Create a new character-stream writer whose critical sections will synchronize on the writer itself.

Writer

protected Writer(Object lock)

Create a new character-stream writer whose critical sections will synchronize on the given object. lock - Object to synchronize on.

Method Details

close

public abstract void close()
                    throws IOException

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.

Specified by:

close in interface AutoCloseable

Throws:

IOException

flush

public abstract void flush()
                    throws IOException

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.

Throws:

IOException

write

public void write(char[] cbuf)
           throws IOException

Write an array of characters.

Throws:

IOException

write

public abstract void write(char[] cbuf,
 int off,
 int len)
                    throws IOException

Write a portion of an array of characters.

Throws:

IOException

write

public void write(int c)
           throws IOException

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.

Throws:

IOException

write

public void write(String str)
           throws IOException

Write a string.

Throws:

IOException

write

public void write(String str,
 int off,
 int len)
           throws IOException

Write a portion of a string.

Throws:

IOException