Java实现设计模式之责任链模式

/**
 * 处理者接口
 * 定义处理请求的方法
 * 设置下一个处理者
 */
public interface Handler {
    public void handleRequest(int money);
    public void setNextHandler(Handler handler);
}

/**
 * 具体处理者--经理
 */
public class Manager implements Handler {
    Handler handler;
    @Override
    public boolean handleRequest(int money) {
        boolean result = false;
        if(money<1000){
           System.out.println("同意");
            result = true;
        }else{
            //超出处理范围，交给下一个处理着
            if(handler!=null){
             result =  handler.handleRequest(money);
            }
        }
        return  result;
    }
    @Override
    public void setNextHandler(Handler handler) {
        this.handler = handler;
    }
}

/**
 * 具体处理者--总经理
 */
public class GeneralManager implements Handler {
    Handler handler;
    @Override
    public boolean handleRequest(int money) {
        boolean result = false;
        if(money<10000){
            System.out.println("同意");
            result = true;
        }else{
            //超出处理范围，交给下一个处理着
            if(handler!=null){
                result =  handler.handleRequest(money);
            }
        }
        return  result;
    }
    @Override
    public void setNextHandler(Handler handler) {
        this.handler = handler;
    }
}

/**
 * 封装类
 * 将所有的具体处理者封装成一条处理链
 */
public class Contxt {
    private Handler handler1,handler2;
    public Contxt(){
    }
    public void createHandlerChain(){
        handler1 = new Manager();
        handler2 = new GeneralManager();
        handler1.setNextHandler(handler2);
    }
    public void responseRequest(int request){
        handler1.handleRequest(request);
    }
}

public class TestMain {
    public static void main(String args []){
        int meney = 500;
        Contxt context = new Contxt();
        //创建处理链
        context.createHandlerChain();
        //相应请求
        boolean result = context.responseRequest(meney);
        System.out.println(result);
    }
}