0114_과제7

7.java

// 김명지

import java.util.*;

public class a7 {

    public static void main(String[] args) {
        // 입력받기
        System.out.println("[로또 당첨 프로그램]\n");
        Scanner sc = new Scanner(System.in);
        System.out.print("로또 개수를 입력해 주세요.(숫자 1 ~ 10):");
        int amount = sc.nextInt();

        // 당첨 번호 생성
        ArrayList<ArrayList<Integer>> listOfLotto = new ArrayList<>();
        Random random = new Random();
        for (int i = 0; i < amount; i++) {
            System.out.printf("%s\t", (char) ('A' + i));

            ArrayList<Integer> randomList = makeLotto(random);
            listOfLotto.add(randomList);
            printLotto(randomList);
        }
        System.out.println();

        // 로또 발표
        System.out.println("[로또 발표]");
        ArrayList<Integer> announceList = makeLotto(random);
        System.out.print("  \t");
        printLotto(announceList);

        // 로또 결과
        System.out.println();
        System.out.println("[내 로또 결과]");
        for (int i = 0; i < amount; i++) {
            int resultCnt = 0;
            ArrayList<Integer> lotto = listOfLotto.get(i);
            // 발표된 로또에 존재하는지 확인
            HashMap<Integer, Boolean> numExists = new HashMap<>();
            for (Integer num : lotto) {
                numExists.put(num, false);
            }
            for (Integer announce : announceList) {
                if (numExists.containsKey(announce)) {
                    resultCnt++;
                }
            }
            // 출력
            System.out.printf("%s\t", (char) ('A' + i));
            for (int j = 0; j < lotto.size(); j++) {
                System.out.print(lotto.get(j));
                if (j != lotto.size() - 1) System.out.print(",");
            }
            System.out.printf(" => %d개 일치\n", resultCnt);
        }

    }

    private static void printLotto(ArrayList<Integer> randomList) {
        for (int j = 0; j < randomList.size(); j++) {
            System.out.print(randomList.get(j));
            if (j != randomList.size() - 1) System.out.print(",");
        }
        System.out.println();
    }

    private static ArrayList<Integer> makeLotto(Random random) {
        HashSet<Integer> lotto = new HashSet<>();
        while (lotto.size() <= 6) {
            if (lotto.size() == 6) break;
            lotto.add(random.nextInt(45) + 1);
        }
        ArrayList<Integer> randomList = new ArrayList<>(lotto);
        Collections.sort(randomList);
        return randomList;
    }
}