策略模式 about disign-patterns HOT 1 OPEN

public interface WeaponBehavior {
    void useWeapon();
}

public class AxeBehavior implements WeaponBehavior {
    @Override
    public void useWeapon() {
        System.out.println("使用斧头");
    }
}

public class BowAndArrowBehavior implements WeaponBehavior {
    @Override
    public void useWeapon() {
        System.out.println("使用弓箭");
    }
}

public class KnifeBehavior implements WeaponBehavior {
    @Override
    public void useWeapon() {
        System.out.println("使用宝剑");
    }
}

public abstract class Role {
    private WeaponBehavior weaponBehavior;

    public void setWeaponBehavior(WeaponBehavior weaponBehavior) {
        this.weaponBehavior = weaponBehavior;
    }

    public abstract void display();

    public void attack() {
        weaponBehavior.useWeapon();
    }
}

public class King extends Role {
    @Override
    public void display() {
        System.out.println("我是国王");
    }
}
public class Knight extends Role {
    @Override
    public void display() {
        System.out.println("我是骑士");
    }
}

public class StategyMain {
    public static void main(String[] args) {
        King king = new King();
        king.setWeaponBehavior(new AxeBehavior());
        king.attack();
        System.out.println("切换武器中......");
        king.setWeaponBehavior(new BowAndArrowBehavior());
        king.attack();
    }
}