public class boxing
{
   public static void main(String[] args)
   {
      int x, y;
      Integer xobj, yobj;
      
      // Simple primitive types
      x = 10;
      y = 15;
      System.out.println("x is " + x);
      System.out.println("y is " + y);
      System.out.println("x * y = " + x * y);
      System.out.println();
      
      // Wrappers prior to JDK 5.0
      xobj = new Integer(100);
      yobj = new Integer(150);
      System.out.println("xobj is " + xobj);
      System.out.println("yobj is " + yobj);
      System.out.println("xobj * yobj = " + 
			 xobj.intValue() * yobj.intValue());
      System.out.println();
      
      // Wrappers with JDK 5.0 and later
      // Autoboxing
      xobj = 1000;
      yobj = 1500;
      // Auto-unboxing.
      System.out.println("xobj is " + xobj);
      System.out.println("yobj is " + yobj);
      System.out.println("xobj * yobj = " + xobj * yobj);
      System.out.println();
      
   }
}