策略模式

package lloo;

public class Application1 {
  public static  void  main  (String  args[])
  {
	  Character   character=new   Character();
	  character.setWeaponBehavior(new KnifeBehavior());
	  character.setName("king");
	  int n=200;   //武器伤害值
	  character.display(n);  
	  System.out.printf("%s的武器装备:%4d
",character.getName(),character.fight());
	  System.out.println("匕首刺杀");
	  character.setWeaponBehavior(new SwordBehavior());
	  character.setName("Queen");
	  int n1=400;   //武器伤害值
	  character.display(n1);  
	  System.out.printf("%s的武器装备:%4d
",character.getName(),character.fight());
	  System.out.println("长剑刺杀");
	  character.setWeaponBehavior(new AxeBehavior());
	  character.setName("Knight");
	  int n2=300;//武器伤害值
	  character.display(n2); 
	  System.out.printf("%s的武器装备:%4d
",character.getName(),character.fight());
	  System.out.println("斧头劈砍");
	  character.setWeaponBehavior(new BowAndArrowBehavior());
	  character.setName("Troll");
	  int n3=100;   //武器伤害值
	  character.display(n3);  
	  System.out.printf("%s的武器装备:%4d
",character.getName(),character.fight());
	  System.out.println("弹弓射击");
  }
}

　　

package lloo;

public class AxeBehavior   implements WeaponBehavior {
public  void useWeapon(int n)
{
}
}

package lloo;

public class BowAndArrowBehavior  implements  WeaponBehavior {

	
	public void useWeapon(int n)
	{
		
	}

}

package lloo;

public class Character {
        WeaponBehavior    weaponBehavior;
        	String  name;
        	int  f;
        public    void  setWeaponBehavior(WeaponBehavior  weaponBehavior)
        {
        	this.weaponBehavior=weaponBehavior;
        }
public void  display(int n)
{
	f=n;
	if (weaponBehavior!=null)
		   weaponBehavior.useWeapon(n);
	   else 
		   System.out.println("没有武器可用");
}
public int  fight( )
{
	return f;
}
public void setName(String s)
{
	name=s;
}
public  String getName()
{
	 return  name;
}
}

　　

package lloo;

public class  KnifeBehavior   implements  WeaponBehavior {
	
	public void useWeapon(int n) {
	
		
	}

}

　　

package lloo;

public class SwordBehavior  implements WeaponBehavior
{
	public void useWeapon(int n) {
		
		
	}
}

　　

package lloo;

public interface WeaponBehavior {
    public  void   useWeapon(int  n);
}