起风网定义
定义算法族，分别封装起来，让他们之间可以互相替换，此模式让 算法的吧变化独立于使用算法的客户
UML
参考代码
#Character
package designmodel;public abstract class Character { WeaponBehavior weaponBehavior; public void setWeaponBehavior(WeaponBehavior weaponBehavior) { this.weaponBehavior = weaponBehavior; } public void showWeapon() { weaponBehavior.useWeapon(); } public abstract void fight();}
#King
package designmodel;public class King extends Character{ public King() { this.weaponBehavior = new SwordBehavior(); } @Override public void fight() { System.out.println("King fight"); }}
#Queen
package designmodel;public class Queen extends Character{ public Queen() { this.weaponBehavior = new KnifeBehavior(); } @Override public void fight() { System.out.println("Queen fight"); }}
#Knight
package designmodel;public class Knight extends Character{ public Knight() { weaponBehavior = new BowAndArrowBehavior(); } @Override public void fight() { System.out.println("Knigh fight"); }}
#WeaponBehavior
package designmodel;public interface WeaponBehavior { public void useWeapon();}
#AxeBehavior
package designmodel;public class AxeBehavior implements WeaponBehavior{ @Override public void useWeapon() { System.out.println("使用斧子砍劈"); }}
#BowANdArrowBehavior
package designmodel;public class BowAndArrowBehavior implements WeaponBehavior{ @Override public void useWeapon() { System.out.println("使用弓箭射击"); }}
#KnifeBehavior
package designmodel;public class KnifeBehavior implements WeaponBehavior{ @Override public void useWeapon() { System.out.println("使用匕首刺杀"); }}
#SwordBehavior
package designmodel;public class SwordBehavior implements WeaponBehavior{ @Override public void useWeapon() { System.out.println("使用宝剑挥舞"); }}
自测
package designmodel;public class Main { public static void main(String[] args) { Character queue = new Queen(); queue.showWeapon(); queue.setWeaponBehavior(new AxeBehavior()); queue.showWeapon(); }}
结果
使用匕首刺杀使用斧子砍劈
使用到的三个设计原则
找出应用中可能需要变化的部分，把它们独立出来，不要和不需要变化的代码混在一起（本利中使用武器不同，单独出来）
针对接口编程，而不是针对实现编程（绑的太死不容易修改）
多用组合，少用继承
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