随机数---抽奖

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 nums = new ArrayList<>();
        for (int i = 1; i <= 20; i++){
            nums.add(i);
        }
        int math = 20;
        List 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));

        }


    }
}

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