java常用类实现猜数字

一、实现0-100随机数字猜数字

import java.util.Random;
import java.util.Scanner;


public class HelloWorld {
    public static void main(String[] args) {
        //随机生成0-100之间答案
        Random r = new Random();
        int answer = r.nextInt(101);

        //获取猜测数字
        Scanner guess = new Scanner(System.in);
        System.out.print("请输入猜测的值：");
        int b = guess.nextInt();

        //比较
        while (b != answer) {
            if (b < answer) {
                System.out.println("小了");
            } else {
                System.out.println("大了");
            }
            System.out.print("请输入猜测的值：");
            b = guess.nextInt();

        }
        System.out.println("猜对了！");
    }
}