[JAVA] 12. 상속 Ⅴ. 컴퍼지션 (버거)

• 파일 트리

1. 버거 객체

package comp;

public class Burger {
    private String name;
    private int price;

    public Burger(String name, int price) {
        this.name = name;
        this.price = price;
        System.out.println(name + "가 만들어졌어요.");
    }

    public String getName() {
        return name;
    }

    public int getPrice() {
        return price;
    }
}

2. 콜라 객체

package comp;

public class Coke {
    private String name;
    private int price;

    public Coke(String name, int price) {
        this.name = name;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public int getPrice() {
        return price;
    }
}

3. 쉬림프 버거(버거를 상속하는)

package comp;

public class ShrimpBurger extends Burger {
    private String material;

    public ShrimpBurger(String name, int price, String material) {
        super(name, price);
        this.material = material;
    }

    public String getMaterial() {
        return material;
    }
}

4. 버거 세트

package comp;

// DI (has)
public class BurgerSet {
    // 다른 객체로부터 의존성을 주입받고 싶을 때
    private final Burger burger;
    private final Coke coke;

    public BurgerSet(Burger burger, Coke coke) {
        this.burger = burger;
        this.coke = coke;
    }

    public Burger getBurger() {
        return burger;
    }

    public Coke getCoke() {
        return coke;
    }

    // 사용자를 위한 getter를 만들어 봅시다.
    public int getTotalPrice() {
        return burger.getPrice() + coke.getPrice();
    }

    public String getAllNames() {
        return burger.getName() + " " + coke.getName();
    }
}

5. 주문

package comp;

public class LotteApp {
    public static void main(String[] args) {
        // 1. 버거만 주세요 (1000, 버거)
        Burger buger1 = new Burger("버거", 1000);
        System.out.println("이름=" + buger1.getName());
        System.out.println("가격=" + buger1.getPrice());
        // 2. 콜라만 주세요 (500, 콜라)
        Coke coke1 = new Coke("콜라", 500);
        System.out.println("이름=" + coke1.getName());
        System.out.println("가격=" + coke1.getPrice());
        // 3. 쉬림프 버거 주세요 (새우, 2000, 새우버거)
        Burger shrimp1 = new ShrimpBurger("새우버거", 2000, "새우");
        System.out.println("이름=" + shrimp1.getName());
        System.out.println("가격=" + shrimp1.getPrice());
        // 4. 버거세트 주세요
        Burger burger2 = new Burger("버거", 1000);
        Coke coke2 = new Coke("콜라", 500);
        BurgerSet burgerSet = new BurgerSet(burger2, coke2);
        System.out.println("이름=" + burgerSet.getAllNames());
        System.out.println("가격=" + burgerSet.getTotalPrice());

    }
}