class ParentA
{
	public void ShowPA()
	{
		System.out.println( "from ParentA" );
	}
}

class ParentB
{
	public void ShowPB()
	{
		System.out.println( "from ParentB" );
	}
}

class Child extends ParentA
{
	public void ShowPA()
	{
		System.out.println( "showPA from Child" );
	}
	
	public ParentB foo()
	{
		return new ParentB()
		{
			public void ShowPB()
			{
				System.out.println( "showPB from Child" );
			}
		};
	}
}

public class MultiClasses
{
	public static void testParentA( ParentA ob )
	{
		ob.ShowPA();
	}
	
	public static void testParentB( ParentB ob )
	{
		ob.ShowPB();
	}
	
	public static void main( String[] args )
	{
		ParentA pA = new ParentA();
		ParentB pB = new ParentB();
		Child child = new Child();
		
		testParentA( child );
		testParentB( child.foo() );
	}

}