Java Random

​​黑马程序员全套Java教程_Java基础入门视频教程，零基础小白自学Java必备教程_哔哩哔哩_bilibili​​

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

public class Main {
    public static void main(String[] args) {
        Random ra = new Random();
        int num = ra.nextInt(10);
        System.out.println("num:" + num);

        for(; num < 10; num++){
            System.out.println(num);
        }


    }
}

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

public class Main {
    public static void main(String[] args) {
        Random ra = new Random();
//        1-100之间的随机数
        int num = 0;
        while(num != 100){
            num = ra.nextInt(100)  + 1;
            System.out.println("num:" + num);
        }

        System.out.println("Hello World");


    }
}