装饰器模式

public interface ISource {    public void operation();   }

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public class Source implements ISource {    public void operation() {        System.out.println("原始类方法");    }}

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public class Decorator1 implements ISource {    private ISource source;        public Decorator1(ISource source){        this.source = source;    }        public void operation() {        System.out.println("第一个装饰器前");        source.operation();        System.out.println("第一个装饰器后");    }}

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public class Decorator2 implements ISource {    private ISource source;        public Decorator2(ISource source){        this.source = source;    }        public void operation() {        System.out.println("第二个装饰器前");        source.operation();        System.out.println("第二个装饰器后");    }}

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public class Decorator3 implements ISource {    private ISource source;        public Decorator3(ISource source){        this.source = source;    }        public void operation() {        System.out.println("第三个装饰器前");        source.operation();        System.out.println("第三个装饰器后");    }}

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public class Client {    public static void main(String[] args) {        ISource source = new Decorator3(new Decorator2(new Decorator1(new Source())));        source.operation();    }}

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