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這不是很戲劇化的發展嗎

繼承練習0322

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作業內容是將下列C++程式碼改成Java的。

C++
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#include <iostream>

using namespace std;

class Object{
    protected:
        int dmg;
	public:
	    Object(){
            dmg = 0;
	    }
	    Object(int x){
            dmg = x;
	    }
		void Action(){
			cout<<"Do nothing......"<<endl;
		}
		void MoveTo(int x, int y){
            cout<<"Walking to location("<<x<<","<<y<<")"<<endl;
		}
		void Attack(int dmg){
            cout<<"Attack......."<<endl;
            cout<<"Damage: "<<dmg<<endl;
		}
};

class NPC: public Object{

};

class Player: public Object{
    private:
        int magicDmg;
    public:
        Player(){
            Object(10);
            magicDmg = 10;
            cout<<"dmg = "<<dmg<<endl;
            cout<<"magicDmg = "<<magicDmg<<endl;
        }
    	void Action(){
			MoveTo(10,20);
		}
		void Attack(){
            cout<<"Casting magic......"<<endl;
            Object::Attack(dmg+magicDmg);
		}
};

class Monster: public Object{
    public:
        Monster(){
            Object(20);
            cout<<"dmg = "<<dmg<<endl;
        }
    	void MoveTo(int x, int y){
            cout<<"Flying to location("<<x<<","<<y<<")"<<endl;
		}
		void Action(){
			MoveTo(10,20);
			Attack(dmg);
		}
};

class Building: public Object{
};

int main(){
	
	cout<<"NPC: "<<endl;
	NPC npc;
    npc.Action();

    cout<<"---------------------------"<<endl;
    cout<<"Player: "<<endl;
 	Player player;
    player.Action();

    cout<<"---------------------------"<<endl;
    cout<<"Monster: "<<endl;
	Monster monster;
    monster.Action();

    cout<<"---------------------------"<<endl;
    cout<<"Player: fight back...."<<endl;
    player.Attack();

    cout<<"---------------------------"<<endl;
    cout<<"Building: "<<endl;
    Building building;
    building.Action();


	return 0;
}

其實這兩種語法感覺上並沒有差太多，大部分時間都花在把 cout 改成 System.out.print(汗，需要注意的是 Java 的繼承是用 extends，還有在子類別呼叫父類別建構子時要使用一個特別的函數 super()，不能直接用父類別名稱呼叫，修改完成的程式碼如下。

Java
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package homework0322;

class Object{
    protected int dmg;
	public Object(){
		dmg = 0;
	}
    public Object(int x){
        dmg = x;
    }
	public void Action(){
		System.out.print("Do nothing......\n");
	}
	public void MoveTo(int x, int y){
        System.out.print("Walking to location(" + x + "," + y + ")\n");
	}
	public static void Attack(int dmg){
        System.out.print("Attack.......\n");
        System.out.print("Damage: " + dmg + "\n");
	}
};
class NPC extends Object{

};

class Player extends Object{
    private int magicDmg;
    public Player(){
        super(10);
        magicDmg = 10;
        System.out.print("dmg = " + dmg + "\n");
        System.out.print("magicDmg = " + magicDmg + "\n");
    }
	public void Action(){
		MoveTo(10,20);
	}
	public void Attack(){
        System.out.print("Casting magic......\n");
        Object.Attack(dmg+magicDmg);
	}
};
class Monster extends Object{
    public Monster(){
        super(20);
        System.out.print("dmg = " + dmg + "\n");
    }
	public void MoveTo(int x, int y){
        System.out.print("Flying to location(" + x + "," + y + ")\n");
	}
	public void Action(){
		MoveTo(10,20);
		Attack(dmg);
	}
};
class Building extends Object{
};

public class HW0322 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.print("NPC: \n");
		NPC npc = new NPC();
		npc.Action();
		System.out.print("---------------------------\n");
	    System.out.print("Player: \n");
	 	Player player = new Player();
	    player.Action();

	    System.out.print("---------------------------\n");
	    System.out.print("Monster: \n");
		Monster monster = new Monster();
	    monster.Action();

	    System.out.print("---------------------------\n");
	    System.out.print("Player: fight back....\n");
	    player.Attack();

	    System.out.print("---------------------------\n");
	    System.out.print("Building: \n");
	    Building building = new Building();
	    building.Action();

	}

}

結果