class MultiplexOutputStream extends OutputStream {
        private final OutputStream[] streams;

        public MultiplexOutputStream (OutputStream... streams) {
            if (streams == null) throw new IllegalArgumentException("streams cannot be null.");
            this.streams = streams;
        }

        public void write (int b) throws IOException {
            for (int i = 0; i < streams.length; i++) {
                synchronized (streams[i]) {
                    streams[i].write(b);
                }
            }
        }

        public void write (byte[] b, int off, int len) throws IOException {
            for (int i = 0; i < streams.length; i++) {
                synchronized (streams[i]) {
                    streams[i].write(b, off, len);
                }
            }
        }
    }