随机数

从 1 - 20里面随机抽取10个不同的数

package com.classmassage.cn.util;import java.util.ArrayList;
import java.util.List;
import java.util.Random;public class Sjs {public static void main(String[] args) {List<Integer> nums = new ArrayList<>();for (int i = 1; i <= 20; i++){nums.add(i);}int math = 20;List<Integer> sysout = new ArrayList<>();for(int j = 0; j < 10; j++){Random r = new Random();int sjs = r.nextInt(math - j);sysout.add(nums.get(sjs));nums.remove(sjs);}for (int s = 0; s < 10; s++){System.out.println(sysout.get(s));}}
}