//Chapter 9 inheritance stuff crammed into here
//part 1

public class Inheritance1 {
    public static void main( String[] args ) {
	X x1 = new X();
	Y y1 = new Y();

	//instanceof operator determines the class of an object
	// object instanceof classname
	if ( x1 instanceof X )
	    System.out.println( "x1 is-a X" );
	if ( x1 instanceof Object )
	    System.out.println( "x1 is-a Object" );
	if ( x1 instanceof Y )     //false
	    System.out.println( "x1 is-a Y" );   
	else
	    System.out.println( "x1 is-NOT-a Y" );   

	if ( y1 instanceof Y )
	    System.out.println( "y1 is-a Y" );
	if ( y1 instanceof X )
	    System.out.println( "y1 is-a X" );
	if ( y1 instanceof Object )
	    System.out.println( "y1 is-a Object" );

    }
}


//superclass (base class) of Y
class X {}

//subclass (derived class) of X
class Y extends X {}


//(these are non-public only for illustration purposes)