Answer to Question #259166 in Java | JSP | JSF for thando

Question

We now write the subclasses of Item to represent the actual multimedia items (viz.

CDs (music) and DVDs (movies)) we store. There are two issues to consider for

these subclasses:

• Note the rules for constructors require a call to the superclass constructor.

The idea is to call the superclass constructor to initialize the fields in the

superclass.

• Use overridden methods for subclass specific behaviour. In particular we

need to override the toString method as this is different for each subclass.

We will also override the depreciate method since each item depreciates

differently.

Answer 1

public interface CDs {
    default public int play(startButton button) {
        System.out.println("Play the music");
    }
}
public interface DVDs {
    default public int play(startButton button) {
        System.out.println("Play the movies");
    }
}
public class Player implements CDs, DVDs {
    public int play(startButton button) {
        DVDs.super.play(button);
        CDs.super.play(button);
    }
}