This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.


java.io
class Writer

java.lang.Object extended by java.io.Writer
All Implemented Interfaces:
Closeable, Flushable, Appendable
Direct Known Subclasses:
BufferedWriter, CharArrayWriter, FilterWriter, OutputStreamWriter, PipedWriter, PrintWriter, StringWriter

Most common way to construct:

Writer out = new FileWriter("LetterHome");

Based on 17 examples


public abstract class Writer
extends Object
implements Appendable, Closeable, Flushable

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.

See Also (auto-generated):

Reader

OutputStream


Field Summary
protected Object lock
          The object used to synchronize operations on this stream.
 
Constructor Summary
protected

          Creates a new character-stream writer whose critical sections will synchronize on the writer itself.
protected
Writer(Object lock)

          Creates a new character-stream writer whose critical sections will synchronize on the given object.
 
Method Summary
 Writer
append(char c)

          Appends the specified character to this writer.
 Writer

          Appends the specified character sequence to this writer.
 Writer
append(CharSequence csq, int start, int end)

          Appends a subsequence of the specified character sequence to this writer.
abstract void

          Closes the stream, flushing it first.
abstract void

          Flushes the stream.
 void
write(char[] cbuf)

          Writes an array of characters.
abstract void
write(char[] cbuf, int off, int len)

          Writes a portion of an array of characters.
 void
write(int c)

          Writes a single character.
 void

          Writes a string.
 void
write(String str, int off, int len)

          Writes a portion of a string.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

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 Detail

Writer

protected Writer()
Creates a new character-stream writer whose critical sections will synchronize on the writer itself.


Writer

protected Writer(Object lock)
Creates a new character-stream writer whose critical sections will synchronize on the given object.

Parameters:
lock - Object to synchronize on
Method Detail

append

public Writer append(char c)
              throws IOException
Appends the specified character to this writer.

An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation

     out.write(c) 

Parameters:
c - The 16-bit character to append
Returns:
This writer
Throws:
IOException - If an I/O error occurs

append

public Writer append(CharSequence csq)
              throws IOException
Appends the specified character sequence to this writer.

An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation

     out.write(csq.toString()) 

Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.

Parameters:
csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.
Returns:
This writer
Throws:
IOException - If an I/O error occurs

append

public Writer append(CharSequence csq,
                     int start,
                     int end)
              throws IOException
Appends a subsequence of the specified character sequence to this writer. Appendable.

An invocation of this method of the form out.append(csq, start, end) when csq is not null behaves in exactly the same way as the invocation

     out.write(csq.subSequence(start, end).toString()) 

Parameters:
csq - The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".
start - The index of the first character in the subsequence
end - The index of the character following the last character in the subsequence
Returns:
This writer
Throws:
IOException - If an I/O error occurs

close

public abstract void close()
                    throws IOException
Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.

Throws:
IOException - If an I/O error occurs

flush

public abstract void flush()
                    throws IOException
Flushes 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.

If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written to the stream are passed to the operating system for writing; it does not guarantee that they are actually written to a physical device such as a disk drive.

Throws:
IOException - If an I/O error occurs

write

public void write(char[] cbuf)
           throws IOException
Writes an array of characters.

Parameters:
cbuf - Array of characters to be written
Throws:
IOException - If an I/O error occurs

write

public abstract void write(char[] cbuf,
                           int off,
                           int len)
                    throws IOException
Writes a portion of an array of characters.

Parameters:
cbuf - Array of characters
off - Offset from which to start writing characters
len - Number of characters to write
Throws:
IOException - If an I/O error occurs

write

public void write(int c)
           throws IOException
Writes 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.

Parameters:
c - int specifying a character to be written
Throws:
IOException - If an I/O error occurs

write

public void write(String str)
           throws IOException
Writes a string.

Parameters:
str - String to be written
Throws:
IOException - If an I/O error occurs

write

public void write(String str,
                  int off,
                  int len)
           throws IOException
Writes a portion of a string.

Parameters:
str - A String
off - Offset from which to start writing characters
len - Number of characters to write
Throws:
IOException - If an I/O error occurs


This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
This page displays the Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.