【JAVA】猜数字

import java.util.*;



public class GN {

    public static void main(String arg[]) {

        int a = 0;// 数字标记

        int b = 0;// 位置标记

        int time = 0;// 次数

        int rdn[] = new int[5];

        Random rd = new Random();



        do {

            rdn[0] = rd.nextInt(9);

            rdn[1] = rd.nextInt(9);

            rdn[2] = rd.nextInt(9);

            rdn[3] = rd.nextInt(9);// 生成四个随机数字。

            if (rdn[0] == 0 || rdn[0] == rdn[1] || rdn[0] == rdn[2]

                    || rdn[0] == rdn[3] || rdn[1] == rdn[2] || rdn[1] == rdn[3]

                    || rdn[1] == rdn[4] || rdn[2] == rdn[3] || rdn[2] == rdn[4]

                    || rdn[3] == rdn[4])

                continue;

            else

                break;

        } while (true);



        do {

            System.out.println("请输入您所猜的数字：");

            Scanner s = new Scanner(System.in);

            int n = s.nextInt();

            String x = String.valueOf(n);

            if (n == 1)

                System.out.println(rdn[0] + "" + rdn[1] + "" + rdn[2] + ""

                        + rdn[3]);

            int num[] = new int[4];

            num[0] = n / 1000;

            num[1] = n / 100 % 10;

            num[2] = n % 100 / 10;

            num[3] = n % 10;// 处理键入的数字

            if (num[0] == 0) {

                System.out.println("输入的数字不能以零开头，请重新输入。");

            } else if (x.length() > 4 || x.length() <= 0)

                System.out.println("输入的数字不符合要求，请重新输入。");

            else if (x.length() == 4) {

                time++;

                a = 0;

                b = 0;

                for (int i = 0; i <= 3; i++) {

                    for (int j = 0; j <= 3; j++) {

                        if (num[i] == rdn[j])

                            if (i == j)

                                b++;

                            else

                                a++;



                    }

                }

                if (b != 4)

                    System.out.println("数字相同而位置不同有 " + a + " 个，位置和数字都相同有 " + b

                            + " 个");

                if (b != 4 && time > 5)

                    System.out.println("你个笨蛋，都猜" + time + "次了，还猜不对!");

            }

            if (b == 4) {

                System.out.println("恭喜你，猜对了！一共猜了" + time + "次。");

                break;

            }

        } while (true);



    }



}