装饰器模式

最新推荐文章于 2025-05-06 14:57:57 发布

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本文通过Java实现了一个简单的装饰者模式案例，展示了如何不改变现有类结构的前提下动态地为对象添加职责。通过多重装饰，演示了如何扩展核心功能并保持代码灵活性。

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public interface ISource {

    public void operation();   

}

public class Source implements ISource {

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

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");
    }
}

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");
    }
}

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");
    }
}

public class Client {

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