public class mytester
{
   public static void main(String[] args)
   {
      // new MyClass variable
      MyClass mcVar = new MyClass(56, "MyClass string");
      // new MySubClass variable
      MySubClass mscVar = new MySubClass();
      // MyClass ref variable.
      MyClass mcRefVar;
      
      // Display contents of mcVar. implicit call to toString()
      System.out.println(mcVar);
      // Display contentsoif mscVar. implicit call to toString()
      System.out.println(mscVar);
 
      mscVar.setString("MySubClass string");
      mscVar.setDouble(3.1415926);
      mscVar.setChar('K');
      
      mcRefVar = mcVar;
      if ( mcRefVar instanceof MyClass )
	System.out.println("\nmcRefVar refers to a MyClass object.");
      System.out.println(mcRefVar);
 
      // Polymorphic reference invokes toString() of MySubClass
      // due to late binding.
      mcRefVar = mscVar;
      if ( mcRefVar instanceof MySubClass )
	System.out.println("\nmcRefVar refers to a MySubClass object.");
      System.out.println(mcRefVar);
   }
}