设计模式Decrator

最新推荐文章于 2025-08-22 08:37:14 发布

转载最新推荐文章于 2025-08-22 08:37:14 发布 · 63 阅读

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原文链接：https://my.oschina.net/kingwjb/blog/261862

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#设计模式 #python

2019独角兽企业重金招聘Python工程师标准>>>

public class Decorator {

        public static void main(String agrs[]) {
                    Greeting1 g = new AfterGreeting(new BeforeGreeting(new Greeting1Impl()));
                    g.sayHello("king");
        }

}

interface Greeting1 {

        void sayHello(String name);

}

class Greeting1Impl implements Greeting1 {

        public void sayHello(String name) {
                    System.out.println("hello " + name);
        }

}

abstract class DecoratorGreeting implements Greeting1 {

        Greeting1 greeting1;

        public DecoratorGreeting(Greeting1 g) {
                    greeting1 = g;
        }

        @Override
        public void sayHello(String name) {
                    greeting1.sayHello(name);
        }

}

class BeforeGreeting extends DecoratorGreeting {

        public BeforeGreeting(Greeting1 g) {
                    super(g);
        }

        @Override
        public void sayHello(String name) {
                    before();
                    super.sayHello(name);
        }

        private void before() {
                    System.out.println("before...");
        }

}

class AfterGreeting extends DecoratorGreeting {

        public AfterGreeting(Greeting1 g) {
                    super(g);
        }

        @Override
        public void sayHello(String name) {
                    super.sayHello(name);
                    after();
        }

        private void after() {
                    System.out.println("after...");
        }

}

转载于:https://my.oschina.net/kingwjb/blog/261862