import java.util.ArrayList;
import java.util.InputMismatchException;
import java.util.Scanner;
public class GuessNumber {
    public static Scanner scanner = new Scanner(System.in);
    public static ArrayList<Integer> answers = new ArrayList<>();
    public static ArrayList<Integer> guesses = new ArrayList<>();

    public static void main(String[] args) {
        scanner = new Scanner(System.in);
        System.out.println("欢迎来到新猜数字游戏！");
        while (true) {
            answers = generateAnswer();
            while (true) {
                System.out.println("请输⼊4个0-9之间不重复的整数:");
                guesses.clear();
                guesses = receiveGuesses();
                int a = getA();
                int b = getB();
                System.out.println(a + "A" + b + "B");
                if (a == 4 && b == 0) {
                    System.out.println("恭喜你！猜对啦！");
                    break;
                }
            }
            System.out.println("再玩⼉⼀次吗？（y/n）");
            String again = scanner.next();
            if (!again.equalsIgnoreCase("y")) {
                break;
            }
        }
    }

    // ⽣成答案数字⽅法
    public static ArrayList<Integer> generateAnswer() {

        while (answers.size() < 4) {
            int answer = (int) (Math.random() * 10);
            if (!answers.contains(answer)) {
                answers.add(answer);
            }
        }
        return answers;
    }

    // 接受猜测数字⽅法
    public static ArrayList<Integer> receiveGuesses() {
        while (guesses.size() < 4) {
            int guess;
            try {
                guess = scanner.nextInt();
            } catch (InputMismatchException e) {
                System.out.println("请输⼊数字！");
                scanner.next();
                continue;
            }
            if (guess < 0 || guess > 9) {
                System.out.println("请输⼊0-9之间的整数！");
                continue;
            }
            if (!guesses.contains(guess)) {
                guesses.add(guess);
            } else {
                System.out.println("数字已经存在！");
            }
        }
        return guesses;
    }

    // 统计猜测数字中A类数字个数的⽅法
    public static int getA() {
        int a = 0;
        for (int i = 0; i < 4; i++) {
            if (answers.get(i) == guesses.get(i)) {
                a = a + 1;
            }
        }
        return a;
    }

    // 统计猜测数字中B类数字个数的⽅法
    public static int getB() {
            int b = 0;
            for (int i = 0; i < 4; i++) {
                if (answers.contains(guesses.get(i)) && answers.get(i) !=
                        guesses.get(i)) {
                    b = b + 1;
                }
            }
            return b;

        }
    }