inblog logo
|
jjack1
    Java

    [JAVA] 12. 상속 Ⅲ. 메서드 오버라이딩

    최재원's avatar
    최재원
    Feb 14, 2025
    [JAVA] 12. 상속 Ⅲ. 메서드 오버라이딩
    Contents
    1. 오버로딩으로 게임 만들기2. 오버로딩의 한계3. 오버라이딩으로 해결
    ❗
    부모의 메서드를 자식이 재정의 하면!!
    • 부모의 메서드를 호출하는 순간 부모의 메서드가 무효화(오버라이드) 되고
    • 자식의 메서드가 호출된다. (동적바인딩)
    notion image

    1. 오버로딩으로 게임 만들기

    ❗
    DarkTempler (hp=100, power=70)
    Arkan (hp=100, power=70)
     
    5가지 유닛이 서로 다 공격할 수 있게 attack() 구현하기
     
    생성
    → 질럿2
    → 드라군2
    → 다크템플러2
    → 리버2
    → 아칸2 공격 → 질럿이 드라군 공격 hp 확인
    → 질럿이 다크템플러 공격 hp 확인
    → 리버가 아칸 공격 hp 확인
    → 아칸 리버 공격 hp 확인
    → 드라군이 다크템플러 공격 hp 확인
    → 리버가 리버 공격 hp 확인
    아래의 예제를 사용해 코드를 완성하시오.
    package ex05.ch03;

class Protoss {
}

class River {
    int hp;
    int power;

    public River() {
        this.hp = 100;
        this.power = 50;
    }

    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }
}

class Dragoon {
    int hp;
    int power;

    public Dragoon() {
        this.hp = 100;
        this.power = 10;
    }

    // 기존 오브젝트 수정
    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }
}

class Zealot {
    int hp;
    int power;

    public Zealot() {
        this.hp = 100;
        this.power = 20;
    }

    // 기존 오브젝트 수정
    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }
}

public class StarGame {
    public static void main(String[] args) {
        Zealot z1 = new Zealot();
        Zealot z2 = new Zealot();
        Dragoon d1 = new Dragoon();

        z1.attack(d1);
        System.out.println("드라군 d1의 hp : " + d1.hp);

        z1.attack(z2);
        System.out.println("질럿 z2의 hp : " + z2.hp);
    }
}

    2. 오버로딩의 한계

    package ex05.ch03;

class Protoss {
}

class Dragoon {
    int hp;
    int power;

    public Dragoon() {
        this.hp = 100;
        this.power = 10;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Arkan unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(DarkTempler unit) {
        unit.hp = unit.hp - this.power;
    }
}

class Zealot {
    int hp;
    int power;

    public Zealot() {
        this.hp = 100;
        this.power = 20;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Arkan unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(DarkTempler unit) {
        unit.hp = unit.hp - this.power;
    }
}

class River {
    int hp;
    int power;

    public River() {
        this.hp = 100;
        this.power = 50;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Arkan unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(DarkTempler unit) {
        unit.hp = unit.hp - this.power;
    }
}

class Arkan {
    int hp;
    int power;

    public Arkan() {
        this.hp = 100;
        this.power = 70;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Arkan unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(DarkTempler unit) {
        unit.hp = unit.hp - this.power;
    }
};

class DarkTempler {
    int hp;
    int power;

    public DarkTempler() {
        this.hp = 100;
        this.power = 70;
    }

    public void attack(Dragoon unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Zealot unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(River unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(Arkan unit) {
        unit.hp = unit.hp - this.power;
    }

    public void attack(DarkTempler unit) {
        unit.hp = unit.hp - this.power;
    }
}

public class StarGame {
    public static void main(String[] args) {
        Zealot z1 = new Zealot();
        Zealot z2 = new Zealot();
        Dragoon d1 = new Dragoon();
        Dragoon d2 = new Dragoon();
        River r1 = new River();
        River r2 = new River();
        Arkan ar1 = new Arkan();
        Arkan ar2 = new Arkan();
        DarkTempler dt1 = new DarkTempler();
        DarkTempler dt2 = new DarkTempler();

        z1.attack(d1);
        System.out.println("z1질럿->d1드라군 | z1질럿<hp>:" + z1.hp + " / d1드라군<hp>:" + d1.hp + "(↓" + z1.power + ")");
        z2.attack(dt1);
        System.out.println("z2질럿->dt1다크템플러 | z2질럿<hp>:" + z2.hp + " / dt1다크템플러<hp>:" + dt1.hp + "(↓" + z2.power + ")");
        r1.attack(ar1);
        System.out.println("r1리버->ar1아칸 | r1리버<hp>:" + r1.hp + " / ar1아칸<hp>:" + ar1.hp + "(↓" + r1.power + ")");
        ar2.attack(r2);
        System.out.println("ar2아칸->r2리버 | ar2아칸<hp>: " + ar2.hp + " / r2리버<hp>:" + r2.hp + "(↓" + ar2.power + ")");
        d2.attack(dt2);
        System.out.println("d2드라군->dt2다크템플러 | d2드라군<hp>: " + d2.hp + " / dt2다크템플러<hp>:" + dt2.hp + "(↓" + d2.power + ")");
        r1.attack(r2);
        System.out.println("r1리버->r2리버 | r1리버<hp>: " + r1.hp + " / r2리버<hp>:" + r2.hp + "(↓" + r1.power + ")");
    }
}
    notion image

    3. 오버라이딩으로 해결

    package ex05.ch04;

abstract class Protoss {
    abstract int getHp();

    abstract void setHp(int hp);

    abstract int getPower();

    abstract void attack(Protoss protoss);
}

class Dragoon extends Protoss {
    private int hp;
    private int power;

    public Dragoon() {
        this.hp = 100;
        this.power = 10;
    }

    public int getHp() {
        return this.hp;
    }

    public void setHp(int hp) {
        this.hp = hp;
    }

    public int getPower() {
        return this.power;
    }

    public void attack(Protoss protoss) {
        protoss.setHp(protoss.getHp() - this.power);
    }
}

class Zealot extends Protoss {
    private int hp;
    private int power;

    public Zealot() {
        this.hp = 100;
        this.power = 20;
    }

    public int getHp() {
        return this.hp;
    }

    public void setHp(int hp) {
        this.hp = hp;
    }

    public int getPower() {
        return this.power;
    }

    public void attack(Protoss protoss) {
        protoss.setHp(protoss.getHp() - this.power);
    }
}

class River extends Protoss {
    private int hp;
    private int power;

    public River() {
        this.hp = 100;
        this.power = 50;
    }

    public int getHp() {
        return this.hp;
    }

    public void setHp(int hp) {
        this.hp = hp;
    }

    public int getPower() {
        return this.power;
    }

    public void attack(Protoss protoss) {
        protoss.setHp(protoss.getHp() - this.power);
    }
}

class Arkan extends Protoss {
    private int hp;
    private int power;

    public Arkan() {
        this.hp = 100;
        this.power = 70;
    }

    public int getHp() {
        return this.hp;
    }

    public void setHp(int hp) {
        this.hp = hp;
    }

    public int getPower() {
        return this.power;
    }

    public void attack(Protoss protoss) {
        protoss.setHp(protoss.getHp() - this.power);
    }
};

class DarkTempler extends Protoss {
    private int hp;
    private int power;

    public DarkTempler() {
        this.hp = 100;
        this.power = 70;
    }

    public int getHp() {
        return this.hp;
    }

    public void setHp(int hp) {
        this.hp = hp;
    }

    public int getPower() {
        return this.power;
    }

    public void attack(Protoss protoss) {
        protoss.setHp(protoss.getHp() - this.power);
    }
}

public class StarGame {
    public static void main(String[] args) {
        Protoss z1 = new Zealot();
        Protoss z2 = new Zealot();
        Protoss d1 = new Dragoon();
        Protoss d2 = new Dragoon();
        Protoss r1 = new River();
        Protoss r2 = new River();
        Protoss ar1 = new Arkan();
        Protoss ar2 = new Arkan();
        Protoss dt1 = new DarkTempler();
        Protoss dt2 = new DarkTempler();

        z1.attack(d1);
        System.out.println("z1질럿->d1드라군 | z1질럿<hp>:" + z1.getHp() + " / d1드라군<hp>:" + d1.getHp() + "(↓" + z1.getPower() + ")");
        z2.attack(dt1);
        System.out.println("z2질럿->dt1다크템플러 | z2질럿<hp>:" + z2.getHp() + " / dt1다크템플러<hp>:" + dt1.getHp() + "(↓" + z2.getPower() + ")");
        r1.attack(ar1);
        System.out.println("r1리버->ar1아칸 | r1리버<hp>:" + r1.getHp() + " / ar1아칸<hp>:" + ar1.getHp() + "(↓" + r1.getPower() + ")");
        ar2.attack(r2);
        System.out.println("ar2아칸->r2리버 | ar2아칸<hp>: " + ar2.getHp() + " / r2리버<hp>:" + r2.getHp() + "(↓" + ar2.getPower() + ")");
        d2.attack(dt2);
        System.out.println("d2드라군->dt2다크템플러 | d2드라군<hp>: " + d2.getHp() + " / dt2다크템플러<hp>:" + dt2.getHp() + "(↓" + d2.getPower() + ")");
        r1.attack(r2);
        System.out.println("r1리버->r2리버 | r1리버<hp>: " + r1.getHp() + " / r2리버<hp>:" + r2.getHp() + "(↓" + r1.getPower() + ")");

    }
    notion image
    Share article

    jjack1

    RSS·Powered by Inblog