FileDocCategorySizeDatePackage
OutputStream.javaAPI DocphoneME MR2 API (J2ME)5920Wed May 02 17:59:54 BST 2007java.io

OutputStream

public abstract class OutputStream extends Object
This abstract class is the superclass of all classes representing an output stream of bytes. An output stream accepts output bytes and sends them to some sink.

Applications that need to define a subclass of OutputStream must always provide at least a method that writes one byte of output.

version
1.22, 12/04/99 (CLDC 1.0, Spring 2000)
see
java.io.ByteArrayOutputStream
see
java.io.DataOutputStream
see
java.io.InputStream
see
java.io.OutputStream#write(int)
since
JDK1.0

Fields Summary
Constructors Summary
Methods Summary
public voidclose()
Closes this output stream and releases any system resources associated with this stream. The general contract of close is that it closes the output stream. A closed stream cannot perform output operations and cannot be reopened.

The close method of OutputStream does nothing.

exception
IOException if an I/O error occurs.
public voidflush()
Flushes this output stream and forces any buffered output bytes to be written out. The general contract of flush is that calling it is an indication that, if any bytes previously written have been buffered by the implementation of the output stream, such bytes should immediately be written to their intended destination.

The flush method of OutputStream does nothing.

exception
IOException if an I/O error occurs.
public abstract voidwrite(int b)
Writes the specified byte to this output stream. The general contract for write is that one byte is written to the output stream. The byte to be written is the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Subclasses of OutputStream must provide an implementation for this method.

param
b the byte.
exception
IOException if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

public voidwrite(byte[] b)
Writes b.length bytes from the specified byte array
to this output stream. The general contract for write(b)
is that it should have exactly the same effect as the call
write(b, 0, b.length).
param
b the data.
exception
IOException if an I/O error occurs.
see
java.io.OutputStream#write(byte[], int, int)
        write(b, 0, b.length);
    
public voidwrite(byte[] b, int off, int len)
Writes len bytes from the specified byte array
starting at offset off to this output stream.
The general contract for write(b, off, len) is that
some of the bytes in the array b are written to the
output stream in order; element b[off] is the first
byte written and b[off+len-1] is the last byte written
by this operation.


The write method of OutputStream calls
the write method of one argument on each of the bytes to be
written out. Subclasses are encouraged to override this method and
provide a more efficient implementation.


If b is null, a
NullPointerException is thrown.


If off is negative, or len is negative, or
off+len is greater than the length of the array
b, then an IndexOutOfBoundsException is thrown.
param
b the data.
param
off the start offset in the data.
param
len the number of bytes to write.
exception
IOException if an I/O error occurs. In particular,
an IOException is thrown if the output
stream is closed.
        if (b == null) {
            throw new NullPointerException();
        } else if ((off < 0) || (off > b.length) || (len < 0) ||
                   ((off + len) > b.length) || ((off + len) < 0)) {
            throw new IndexOutOfBoundsException();
        } else if (len == 0) {
            return;
        }
        for (int i = 0 ; i < len ; i++) {
            write(b[off + i]);
        }