Using GZIP streams to compress

Question

First time poster, long time reader
I'm trying to write some serializable objects (ArrayLists) to file, but I wanted to compress them first. The GZIP stream isn't doing anything, even when it should. How should I be using it? Thanks if you can help
     public void save( String filename )
          try {
               File file = new File( filename );
               FileOutputStream outStream = new FileOutputStream( file );
               GZIPOutputStream zipOut = new GZIPOutputStream( outStream );
               ObjectOutputStream out = new ObjectOutputStream( zipOut );
               out.writeObject( xList );
               out.writeObject( yList );
               out.writeObject( list );
               out.close();
          } catch (IOException e) {
               System.exit( 1 );
     }

Answer 1

On another note, what is the best way to turn a byte
array into an int array and vice versa?Check out the ByteBuffer class:
ByteBuffer byteBuffer = ByteBuffer.wrap(byteArray);
IntBuffer intBuffer = byteBuffer.asIntBuffer();
// then you can do:
int i = intBuffer.get(i);Hope this helps.