public static void main( String args[] )
   {
       Robot r2d2 = new Robot();
       r2d2.moveRight( 20 );
       r2d2.moveDown( 10 );
       r2d2.moveLeft( 3 );
       System.out.println( "r2d2 coordinates: "+r2d2.getX()+","+r2d2.getY());
       r2d2.moveUp( 5 );
       r2d2.moveRight( 5 );
       System.out.println( "r2d2 coordinates: "+r2d2.getX()+","+r2d2.getY());
       
       //advanced
       
       Robot anotherRobot = new Robot( 20, 40 );
       anotherRobot.moveDown( 50 );
       anotherRobot.moveLeft( 100 );
       System.out.println( "coordinates: "+anotherRobot.getX()+","+anotherRobot.getY());
   }