SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException 
{
                                             
        super(impl.getFileDescriptor());
        this.impl = impl;
        socket = impl.getSocket();
}

Creates a new SocketOutputStream. Can only be called by a Socket. This method needs to hang on to the owner Socket so that the fd will not be closed.

Parameters:

impl - the socket output stream inplemented

 public  void close() throws IOException 
{
         
        // Prevent recursion. See BugId 4484411
        if (closing)
            return;
        closing = true;
        if (socket != null) {
            if (!socket.isClosed())
                socket.close();
        } else
            impl.close();
        closing = false;
}

 protected  void finalize() 
{

}

Overrides finalize, the fd is closed by the Socket.

 public final FileChannel getChannel() 
{
        return null;
}

Returns the unique FileChannel object associated with this file output stream.
The getChannel method of SocketOutputStream returns null since it is a socket based stream.

 public  void write(int b) throws IOException 
{
        temp[0] = (byte)b;
        socketWrite(temp, 0, 1);
}

Writes a byte to the socket.

 public  void write(byte[] b) throws IOException 
{
        socketWrite(b, 0, b.length);
}

Writes the contents of the buffer b to the socket.

 public  void write(byte[] b,
    int off,
    int len) throws IOException 
{
        socketWrite(b, off, len);
}

Writes length bytes from buffer b starting at offset len.