• java设计模式--装饰者模式


    照例搬一篇文章连接,我一般会选择带有uml图的 方便理解,我只贴代码,因为我觉得别人理解的比我透彻,写的比我好 http://www.cnblogs.com/stonefeng/p/5679638.html

    装饰者模式可以给对象添加一些额外的东西,设计模式那种书中举例是星巴克的例子,如果每一种做法都写一个类的话大概会爆炸,所以选择灵活的方式

    1.创建抽象类,定义基本的行为,装饰者和被装饰着都去继承他

    public abstract class Component {

    public String desc = "我是抽象组件,他们的共同父类";

    public String getDesc() {
    return desc;
    }

    public abstract int price();

    }

    2.被装饰者

    public class ACupCoffe extends Component{

    public ACupCoffe() {
    desc = "一杯咖啡";
    }
    @Override
    public int price() {
    // TODO Auto-generated method stub
    return 10;
    }

    }

    3.装饰者

    public abstract class Decorator extends Component{

    public abstract String getDesc();
    }

    4.具体装饰者1

    public class Coffee extends Decorator{

    private Component acupcoffe;

    public Coffee(Component acupcoffe) {
    this.acupcoffe = acupcoffe;
    }
    @Override
    public String getDesc() {
    // TODO Auto-generated method stub
    return acupcoffe.getDesc() + "咖啡";
    }

    @Override
    public int price() {
    // TODO Auto-generated method stub
    return acupcoffe.price() + 10;
    }

    }

    5.具体装饰者2

    public class Sugar extends Decorator{

    private Component acupcoffe;
    public Sugar(Component aCupCoffe) {
    this.acupcoffe = aCupCoffe;
    }
    @Override
    public String getDesc() {

    return acupcoffe.getDesc() + "糖";
    }

    @Override
    public int price() {
    // TODO Auto-generated method stub
    return acupcoffe.price() + 10;
    }

    }

    6.客户端

    public class Client {

    public static void main(String[] args) {
    Component aCupCoffe = new ACupCoffe();

    aCupCoffe = new Sugar(aCupCoffe);
    System.out.println(aCupCoffe.getDesc());
    System.out.println(aCupCoffe.price());

    aCupCoffe = new Coffee(aCupCoffe);
    System.out.println(aCupCoffe.getDesc());
    System.out.println(aCupCoffe.price());
    }

    }

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  • 原文地址:https://www.cnblogs.com/leavesss/p/9969611.html
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