| The implements Keyword |
| To use an interface, we include the implements keyword as part of our class definition |
| // java.applet.Applet is the superclass public class Neko extends java.applet.Applet implements Runnable { // but it also has Runnable behavior ... } |
| After our class implements an interface, subclasses of our class will inherit those new methods (and can override or overload them) just as if our superclass had actually defined them. |
| If your class inherits from a superclass that implements a given interface, we don't have to include the implements keyword in your own class definition. |
| Example- |
| interface Fruitlike { void decay(); void squish(); . . . } class Fruit implements Fruitlike { private Color myColor; private int daysTilIRot; . . . } interface Spherelike { void toss(); void rotate(); . . . } class Orange extends Fruit implements Spherelike { . . . // toss()ing may squish() me (unique to me) } |
| Here the class Orange doesn't have to say implements Fruitlike because, by extending Fruit, it already has! |
| Other Example- |
| class Sphere implements Spherelike { // extends Object private float radius; . . . } class Orange extends Sphere implements Fruitlike { . .// users of Orange never need know about the change! } |
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