java学习笔记-设计模式18(职责链模式)

意图

　　使多个对象都有机会处理请求，从而避免请求的发送者和接收者之间的耦合关系。将这些对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理它为止。

public interface Handler {
    public void operator();
}

public abstract class AbstractHandler {  

    private Handler handler;  

    public Handler getHandler() {
        return handler;
    }  

    public void setHandler(Handler handler) {
        this.handler = handler;
    }  

}

public class MyHandler extends AbstractHandler implements Handler {  

    private String name;  

    public MyHandler(String name) {
        this.name = name;
    }  

    @Override
    public void operator() {
        System.out.println(name+"deal!");
        if(getHandler()!=null){
            getHandler().operator();
        }
    }
}

public class Test {  

    public static void main(String[] args) {
        MyHandler h1 = new MyHandler("h1");
        MyHandler h2 = new MyHandler("h2");
        MyHandler h3 = new MyHandler("h3");  

        h1.setHandler(h2);
        h2.setHandler(h3);  

        h1.operator();
    }
}

　　转自：http://blog.csdn.net/zhangerqing/article/details/8243942