public class CarBodyHandler extends CarHandler{@Overridepublic void HandlerCar() {// TODO Auto-generated method stubSystem.out.println("组装车身");}}

public abstract class CarHandler {public abstract void HandlerCar();
}

public class CarHeadHandler extends CarHandler{@Overridepublic void HandlerCar() {// TODO Auto-generated method stubSystem.out.println("组装车头");}}

public class CarTailHandler extends CarHandler{@Overridepublic void HandlerCar() {// TODO Auto-generated method stubSystem.out.println("组装车尾.");}}

public class MainClass {public static void main(String[] args) {CarHandler headH =  new CarHeadHandler();CarHandler bodyH =  new CarBodyHandler();CarHandler tailH =  new CarTailHandler();//这种方式的缺点是客户端必须手动地调用HandlerCar()//像SERVLET的容器的过滤器的框架的实现是自动的.//就是组装完车头之后你自己组装车身,组装车尾.//我把一个流程给你以后:是先组装车头还是先组装车身.你按照我给定的流程你来执行.//对象的组织-消息的传递-职责的分配-任务的完成
        headH.HandlerCar();bodyH.HandlerCar();tailH.HandlerCar();}
} 

package com.ibeifeng.ex2;public class CarBodyHandler extends CarHandler{@Overridepublic void HandlerCar() {// TODO Auto-generated method stubSystem.out.println("组装车身");if(this.carHandler!=null){this.carHandler.HandlerCar();}}}

package com.ibeifeng.ex2;public class CarHeadHandler extends CarHandler{@Overridepublic void HandlerCar() {// TODO Auto-generated method stubSystem.out.println("组装车头");if(this.carHandler!=null){this.carHandler.HandlerCar();}}}

package com.ibeifeng.ex2;public class CarTailHandler extends CarHandler{@Overridepublic void HandlerCar() {// TODO Auto-generated method stubSystem.out.println("组装车尾.");if(this.carHandler!=null){this.carHandler.HandlerCar();}}}

package com.ibeifeng.ex2;public abstract class CarHandler {protected CarHandler carHandler;//protected属性子类可以访问...//private CarHandler carHandler;//持有自身的引用./*    public void setNextHandler(CarHandler carHandler){this.carHandler =  carHandler;}*/public CarHandler setNextHandler(CarHandler carHandler){this.carHandler =  carHandler;return this.carHandler;}public abstract void HandlerCar();
}

package com.ibeifeng.ex2;public class MainClass {public static void main(String[] args) {CarHandler headH =  new CarHeadHandler();CarHandler bodyH =  new CarBodyHandler();CarHandler tailH =  new CarTailHandler();//这种方式的缺点是客户端必须手动地调用HandlerCar()//像SERVLET的容器的过滤器的框架的实现是自动的.//就是组装完车头之后你自己组装车身,组装车尾.//我把一个流程给你以后:是先组装车头还是先组装车身.你按照我给定的流程你来执行.//对象的组织-消息的传递-职责的分配-任务的完成
/*        headH.HandlerCar();bodyH.HandlerCar();tailH.HandlerCar();*///不需要调用三个类的方法了,而是把顺序预先设定好.//组装顺序预先设定好,顺序是车头->车身->车尾headH.setNextHandler(bodyH);//把第二个设置到第一个里面
        bodyH.setNextHandler(tailH);//调用职责链的链头来完成操作
        headH.HandlerCar();System.out.println("------------------------------");//顺序改变,希望是车身->车头->车尾
        bodyH.setNextHandler(headH);headH.setNextHandler(tailH);bodyH.HandlerCar();System.out.println("--------------------------------------");//简便操作
        bodyH.setNextHandler(headH).setNextHandler(tailH);bodyH.HandlerCar();}
}