【备忘】责任链模式cor(chain of responsibility)

public abstract class Handler {  
    protected Handler successor;  
    protected String name;  
  
    public String getName() {  
        return name;  
    }  
  
    //处理请求，由子类完成   
    public abstract void handleRequest(String request);  
  
    //设置下一个处理请求的人   
    public void setNextHandler(Handler successor) {  
        this.successor = successor;  
    }  
}  

 

       事实上，跟数据结构里的链表差不多。

       然后每个继承Handle的类分别实现handleRequest方法。

public class HandleA extends Handle {
	public void handRequest(Request req){
		if(req.condition1){
			doSomething();
		}else{
		        successor.handleRequest();
		}
	}
}

         最后在main方法中对每个类的对象设置后继结点即可。Handle h1 = new HandleA();

Handle h2 = new HandleB();
Handle h3 = new HandleC();

h1.setNextHandler(h2);
h2.setNextHandler(h3);

String req = "XXXXXXX";

h1.handleRequest(request);