java.io
Class Writer
- Appendable, Closeable, Flushable
This abstract class forms the base of the hierarchy of classes that
write output as a stream of chars. It provides a common set of methods
for writing chars to stream. Subclasses implement and/or extend these
methods to write chars in a particular manner or to a particular
destination such as a file on disk or network connection.
protected Object | lock- This is the object used to synchronize criticial code sections for
thread safety.
|
Writer()- This is the default no-argument constructor for this class.
|
Writer(Object lock)- This method initializes a
Writer that will synchronize
on the specified Object.
|
Writer | append(char c)
|
Writer | append(CharSequence cs)
|
Writer | append(CharSequence cs, int start, int end)
|
abstract void | close()- This method closes the stream.
|
abstract void | flush()- This method forces any data that may have been buffered to be written
to the underlying output device.
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void | write(char[] buf)- This method all the writes char from the passed array to the output
stream.
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abstract void | write(char[] buf, int offset, int len)- This method writes
len char from the specified array
buf starting at index offset into the array.
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void | write(int b)- This method writes a single char to the output stream.
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void | write(String str)- This method writes all the characters in a
String to the
output.
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void | write(String str, int offset, int len)- This method writes
len chars from the String
starting at position offset.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
lock
protected Object lock
This is the object used to synchronize criticial code sections for
thread safety. Subclasses should use this field instead of using
synchronized methods or explicity synchronizations on this
Writer
protected Writer()
This is the default no-argument constructor for this class. This method
will set up the class to synchronize criticial sections on itself.
Writer
protected Writer(Object lock)
This method initializes a Writer that will synchronize
on the specified Object.
lock - The Object to use for synchronizing critical
sections. Must not be null.
close
public abstract void close()
throws IOException This method closes the stream. Any internal or native resources
associated
with this stream are freed. Any subsequent attempt to access the stream
might throw an exception.
This method in this class does nothing.
- close in interface Closeable
flush
public abstract void flush()
throws IOException This method forces any data that may have been buffered to be written
to the underlying output device. Please note that the host environment
might perform its own buffering unbeknowst to Java. In that case, a
write made (for example, to a disk drive) might be cached in OS
buffers instead of actually being written to disk.
- flush in interface Flushable
write
public void write(char[] buf)
throws IOException This method all the writes char from the passed array to the output
stream. This method is equivalent to
write(buf, 0, buf.length) which
is exactly how it is implemented in this class.
buf - The array of char to write
write
public abstract void write(char[] buf,
int offset,
int len)
throws IOException This method writes
len char from the specified array
buf starting at index
offset into the array.
Subclasses must provide an implementation of this abstract method.
buf - The array of char to write fromoffset - The index into the array to start writing fromlen - The number of char to write
write
public void write(int b)
throws IOException This method writes a single char to the output stream.
b - The char to be written to the output stream, passed as an int
write
public void write(String str)
throws IOException This method writes all the characters in a String to the
output.
str - The String whose chars are to be written.
write
public void write(String str,
int offset,
int len)
throws IOException This method writes len chars from the String
starting at position offset.
str - The String that is to be writtenoffset - The character offset into the String to start
writing fromlen - The number of chars to write
Writer.java -- Base class for character output streams
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