The I/O Package - The Java Programming Language - page 753

Equivalent to write(buf,0, buf.length) .
public void write(String str, int offset, int count) throws IOExcep-
tion
Writes count characters from the string str onto the stream,
starting with str.charAt(offset) .
public void write(String str) throws IOException
Equivalent to write(str,0, str.length()) .
public abstract void flush() tHRows IOException
Flushes the stream. If the stream has buffered any characters
from the various write methods, flush immediately writes
them to their destination. Then, if that destination is another
stream, it is also flushed. One flush invocation will flush all
the buffers in a chain of streams. If a stream is not buffered
flush will do nothing.
public abstract void close() throws IOException
Closes the stream, flushing if necessary. This method should
be invoked to release any resources (such as file descriptors)
associated with the stream. Once a stream has been closed,
further operations on the stream will throw an IOException .
Closing a previously closed stream has no effect.
Subclasses of Writer must implement the array writing variant of write ,
the close method, and the flush method. All other Writer methods are
implemented in terms of these three. This contrasts with OutputStream
which uses the single-byte variant of write method as the fundament-
al writing method, and which provides default implementations of flush
and close . As with Reader , many subclasses can improve performance if
they also override other methods.