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);}
}
【JAVA】猜数字