策略模式--红色警戒2之兵种设计

策略模式--红色警戒2之兵种设计

 

策略模式：针对同类算法的不同实现抽象成算法接口，并分别实现种具体的策略。此算法接口可以有多个。这样算法的变化就独立于算法的使用者。使用者使用的仅仅是策略接口。

 

下面给出一个实际的例子：

 

红色警戒2中的美国大病为例（大兵，火箭飞行兵，探亚，时空兵），这些兵种都有一个共性：能移动，会***。而他们移动和***的方式各不相同。

 

如何设计这样的兵种，让使用者不再关心具体的细节，只关心他们是兵就ok了。

 

思路：

设计一个***接口Attackable，设计一个移动接口Moveable，定义一个抽象的父类（Soldier）。

 

/**
* ***接口
*
* @author leizhimin 11-12-18 下午5:13
*/
public interface Attackable {
        //***
        void attacking();
}

 

/**
* 移动接口
*
* @author leizhimin 11-12-18 下午5:13
*/
public interface Moveable {
        void moving();
}

 

/**
* 士兵抽象类
*
* @author leizhimin 11-12-18 下午5:14
*/
public abstract class Soldier {
        private Attackable attackable;        //***接口对象
        private Moveable moveable;                //移动接口对象

        public Soldier(Attackable attackable, Moveable moveable) {
                this.attackable = attackable;
                this.moveable = moveable;
        }

        //每个士兵都会挂掉，惨叫一声、挂了后从单元集合中移除
        public void dead() {
                doScreech();                                    //惨叫一声
                System.out.println("挂了，被系统从单元队列中移除！");
        }

        //所有的兵死前都会惨叫，这个是惨叫声，需要具体的士兵实现
        abstract void doScreech();

        public Attackable getAttackable() {
                return attackable;
        }

        public Moveable getMoveable() {
                return moveable;
        }
}

 

具体的***方式：

/**
* 小手枪***
*
* @author leizhimin 11-12-18 下午6:00
*/
public class HandgunAttack implements Attackable {
        public void attacking() {
                System.out.println("小手枪***，噼~噼~噼~~~");
        }
}

 

/**
* AK47***
*
* @author leizhimin 11-12-18 下午5:57
*/
public class Ak47Attack implements Attackable{
        public void attacking() {
                System.out.println("AK47***，哒哒哒......");
        }
}

 

具体的移动方式：

 

/**
* 天上飞行
*
* @author leizhimin 11-12-18 下午6:05
*/
public class SkyMove implements Moveable{
        public void moving() {
                System.out.println("天上飞行！");
        }
}

 

/**
* 陆地走动
*
* @author leizhimin 11-12-18 下午6:04
*/
public class WalkMove implements Moveable{
        public void moving() {
                System.out.println("陆地走动！");
        }
}

 

/**
* 陆地走动或者水里游动
*
* @author leizhimin 11-12-18 下午6:07
*/
public class WalkOrSwimMove implements Moveable{
        public void moving() {
                System.out.println("陆地走动或者水里游动！");
        }
}

 

 

然后定义三种类型的士兵：

/**
* 探亚
*
* @author leizhimin 11-12-18 下午5:50
*/
public class TanyaSoldier extends Soldier {

        public TanyaSoldier(Attackable attackable, Moveable moveable) {
                super(attackable, moveable);
        }

        @Override
        void doScreech() {
                System.out.println("（探亚）呃~~~~~");
        }

}

 

/**
* 飞行兵
*
* @author leizhimin 11-12-18 下午6:19
*/
public class SkySoldier extends Soldier {
        public SkySoldier(Attackable attackable, Moveable moveable) {
                super(attackable, moveable);
        }

        @Override
        void doScreech() {
                System.out.println("(飞行兵)噗——");
        }
}

 

/**
* 美国大兵
*
* @author leizhimin 11-12-18 下午6:15
*/
public class UsSoldier extends Soldier{
        public UsSoldier(Attackable attackable, Moveable moveable) {
                super(attackable, moveable);
        }

        @Override
        void doScreech() {
                System.out.println("(美国大兵)啊————");
        }
}

 

客户端测试：

import java.util.ArrayList;
import java.util.List;

/**
* 客户端
*
* @author leizhimin 11-12-18 下午6:09
*/
public class Test {
        public static void main(String[] args) {
                //具体的***策略
                Attackable ak47Attack = new Ak47Attack();
                Attackable handgunAttack = new HandgunAttack();

                //具体的移动策略
                Moveable walkMove = new WalkMove();
                Moveable walkOrSwimMove = new WalkOrSwimMove();
                Moveable skyMove = new SkyMove();

                //构建具体的兵种
                Soldier tanyaSoldier = new TanyaSoldier(handgunAttack, walkOrSwimMove);
                Soldier usSoldier = new UsSoldier(ak47Attack, walkMove);
                Soldier skySoldier = new SkySoldier(handgunAttack, skyMove);

                List<Soldier> soldierList = new ArrayList<Soldier>();
                soldierList.add(tanyaSoldier);
                soldierList.add(usSoldier);
                soldierList.add(skySoldier);

                for (Soldier soldier : soldierList) {
                        doSomething(soldier);
                }
        }

        /**
         * 做事
         *
         * @param soldier
         */
        public static void doSomething(Soldier soldier) {
                System.out.println("------------------------------------");
                soldier.getMoveable().moving();
                soldier.getAttackable().attacking();
                soldier.dead();
        }
}

 

------------------------------------
陆地走动或者水里游动！
小手枪***，噼~噼~噼~~~
（探亚）呃~~~~~
挂了，被系统从单元队列中移除！
------------------------------------
陆地走动！
AK47***，哒哒哒......
(美国大兵)啊————
挂了，被系统从单元队列中移除！
------------------------------------
天上飞行！
小手枪***，噼~噼~噼~~~
(飞行兵)噗——
挂了，被系统从单元队列中移除！

Process finished with exit code 0

 

 

呵呵，只为深入理解下策略模式，粗糙之处还请拍砖。