// a class to demonstrate how primitive data and objects differ when passed as parameters

public class IncrementClassUser
{
      public static void main(String[] args)
      {
             IncrementClass foo=new IncrementClass(0);
             int x=0;
             increment(foo);		// foo, being an object, can (and will change)
             increment(x);			// x, being an instance datum, will not change here (but the parameter in increment will change)
             System.out.println(foo.getValue( ));
             System.out.println(x);
     }
  
     public static void increment(int value)  {	// value changes, but x does not
            value++;
     }

     public static void increment(IncrementClass foo)  {	// foo does change
            foo.inc();
     }
}