设计模式（策略模式）

本文从HeadFirst阅读后记录：

以下文件在同一目录下，采用策略模式：

character.java：

public abstract class character{
    weaponBehavior weapon_;
	
	public void fight(){
	   weapon_.useWeapon();
	}
	
	public void setWeapon(weaponBehavior w){
	   this.weapon_=w;
	}


}

weaponBehavior.java

public interface weaponBehavior{
    public void useWeapon();

}

knifeBehavior.java

public class knifeBehavior implements weaponBehavior{
    public void useWeapon(){
	   System.out.println("this is a knife");
	}


}

bowAndArrowBehavior.java

public class bowAndArrowBehavior implements weaponBehavior{
    public void useWeapon(){
	   System.out.println("this is a BowAndArrow");
	}

}

axeBehavior.java

public class axeBehavior implements weaponBehavior{
    public void useWeapon(){
	   System.out.println("this is a Axe");
	}
}

swordBehavior.java

public class swordBehavior implements weaponBehavior{
    public void useWeapon(){
	   System.out.println("this is a Sword");
	}

}

queen.java

   public class queen extends character{
	public queen(){
	     weapon_=new knifeBehavior();
	}
};

weapon.java

import java.io.*;

public class weapon {
   public static void main(String[] args){
       queen q=new queen();
	   q.setWeapon(new bowAndArrowBehavior());
	   q.fight();
   }

};

对应的类图：