심플 계산기 II

import java.util.ArrayList;
import java.util.Random;

public class SalesAnalyzer {

    // 주문 리스트
    private ArrayList<Ramyun> ramyunOrders;
    private ArrayList<Kimbob> kimbobOrders;
    private ArrayList<Topokki> topokkiOrders;
    private ArrayList<Twigim> twigimOrders;
    private ArrayList<Sundae> sundaeOrders;
    private ArrayList<Mandu> manduOrders;
    private ArrayList<Odeng> odengOrders;

    public SalesAnalyzer() {
        this.ramyunOrders = new ArrayList<Ramyun>();
        this.kimbobOrders = new ArrayList<Kimbob>();
        this.topokkiOrders = new ArrayList<Topokki>();
        this.twigimOrders = new ArrayList<Twigim>();
        this.sundaeOrders = new ArrayList<Sundae>();
        this.manduOrders = new ArrayList<Mandu>();
        this.odengOrders = new ArrayList<Odeng>();
    }

    // 메인 테스트
    public static void main(String[] args) {
        SalesAnalyzer sales = new SalesAnalyzer();

        // 랜덤 주문 생성.
        sales.randomOrders();

        // 매출 계산.
        int totalSales = sales.calculateSales();
        System.out.println("총 매출액: " + totalSales + "원");
    }

    // 랜덤 주문 생산기
    public void randomOrders() {
        Random random = new Random();
        int n = 51 + random.nextInt(50);

        for (int i = 0; i < n; i++) {
            switch (random.nextInt(7)) {
            case 0:
                addRamyunOrder(new Ramyun());
                break;
            case 1:
                addKimbobOrder(new Kimbob());
                break;
            case 2:
                addTopokkiOrder(new Topokki());
                break;
            case 3:
                addTwgimOrder(new Twigim());
                break;
            case 4:
                addSundaeOrder(new Sundae());
                break;
            case 5:
                addManduOrder(new Mandu());
                break;
            case 6:
                addOdengOrder(new Odeng());
                break;
            }
        }
    }

    // 라면 주문 기록
    public void addRamyunOrder(Ramyun ramyun) {
        ramyunOrders.add(ramyun);
    }

    // 김밥 주문 기록
    public void addKimbobOrder(Kimbob kimbob) {
        kimbobOrders.add(kimbob);
    }

    // 떡복이 주문 기록
    public void addTopokkiOrder(Topokki topokki) {
        topokkiOrders.add(topokki);
    }

    // 튀김 주문 기록
    public void addTwgimOrder(Twigim twigim) {
        twigimOrders.add(twigim);
    }

    // 순대 주문 기록
    public void addSundaeOrder(Sundae sundae) {
        sundaeOrders.add(sundae);
    }

    // 만두 주문 기록
    public void addManduOrder(Mandu mandu) {
        manduOrders.add(mandu);
    }

    // 오뎅 주문 기록
    public void addOdengOrder(Odeng odeng) {
        odengOrders.add(odeng);
    }

    // 매출 계산
    public int calculateSales() {
        int raCount = ramyunOrders.size();
        int kimCount = kimbobOrders.size();
        int toCount = topokkiOrders.size();
        int twiCount = twigimOrders.size();
        int sunCount = sundaeOrders.size();
        int manCount = manduOrders.size();
        int oCount = odengOrders.size();

        int raSales = Ramyun.PRICE * raCount;
        int kimSales = Kimbob.PRICE * kimCount;
        int toSales = Topokki.PRICE * toCount;
        int sunSales = Sundae.PRICE * sunCount;
        int twiSales = Twigim.PRICE * twiCount;
        int manSales = Mandu.PRICE * manCount;
        int oSales = Odeng.PRICE * oCount;

        int totalSales = raSales + kimSales + toSales + sunSales + twiSales
                + manSales + oSales;

        System.out.printf("[라면] %d개: %d원n", raCount, raSales);
        System.out.printf("[김밥] %d개: %d원n", kimCount, kimSales);
        System.out.printf("[떡볶이] %d개: %d원n", toCount, toSales);
        System.out.printf("[튀김] %d개: %d원n", twiCount, twiSales);
        System.out.printf("[순대] %d개: %d원n", sunCount, sunSales);
        System.out.printf("[만두] %d개: %d원n", manCount, manSales);
        System.out.printf("[오뎅] %d개: %d원n", oCount, oSales);
        System.out.println("==================");

        return totalSales;
    }
}

public class Ramyun {
    public static final String NAME = "라면";
    public static final int PRICE = 3000;
}

public class Kimbob {
    public static final String NAME = "김밥";
    public static int PRICE = 2000;
}

public class Topokki {
    public static final String NAME = "떡볶이";
    public static int PRICE = 2000;
}

public class Twigim {
    public static final String NAME = "튀김";
    public static int PRICE = 2000;
}

public class Sundae {
    public static final String NAME = "순대";
    public static int PRICE = 2000;
}

public class Mandu {
    public static final String NAME = "만두";
    public static int PRICE = 2500;
}

public class Odeng {
    public static final String NAME = "오뎅";
    public static int PRICE = 2500;
}