Decoration mode in Design Mode

Decoration mode in Design Mode

Definition: to dynamically add some additional responsibilities to an object, the decoration mode is more flexible than the subclass generation.

Structure:

<喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + yr7A/placement = "brush: java;"> public abstract class Component {public abstract void operation ();} public class ConcreteComponent extends Component {@ Overridepublic void operation () {// TODO Auto-generated method stubSystem. out. println ("specific object operations! ") ;}} Public class ConcreteDecoratorB extends Decorator {@ Overridepublic void operation () {// TODO Auto-generated method stubsuper. operation (); System. out. println ("actions on decoration object B");} private void AddedBehavior () {System. out. println ("B operations") ;}} public class ConcreteDecoratorA extends Decorator {private String addedState; @ Overridepublic void operation () {// TODO Auto-generated method stubsuper. operation (); addedState = "New State"; System. out. println ("actions on decoration object ");}}The client code is as follows:

public class Client {public static void main(String[] args) {ConcreteComponent c = new ConcreteComponent();ConcreteDecoratorA d1 = new ConcreteDecoratorA();ConcreteDecoratorB d2 = new ConcreteDecoratorB();d1.setComponent(c);d2.setComponent(d1);d2.operation();//d1.setComponent(d2);//d1.operation();}}

The running result is as follows:

Specific Object operations!
Operations of decoration object
Operations on decoration object B