package com.sutaoyu.usually_class;

import java.util.Random;

public class String_test15 {

    public static void main(String[] args) {

        Random r = new Random();

        //生成int类型的随机数

        int ran = r.nextInt(11);//生成0-10之间的随机数

        System.out.println(ran);//0

        //循环生成5个随机数

        for(int i = 0;i<5;i++) {

            System.out.println(r.nextInt(11));//8 2 1 1 2

        }

    }

}

package com.monkey1024.random;

import java.util.Arrays;

import java.util.Random;

public class ColorBall {

    public static void main(String[] args) {

        //初始化双色球号码

        int[] balls = new int[33];

        for(int i=0; i<balls.length; i++){

            balls[i] = i + 1;

        }

        //创建数组用来标记红球是否重复

        boolean[] isUsed = new boolean[33];

        //创建数组用来存放6个红球

        int[] result = new int[6];

        //初始化数组下标

        int length = 0;

        Random r = new Random();

        while(true){

            //生成0~32的随机数,将随机数作为数组下标,取得红球

            int red = r.nextInt(33);

            //判断生成的红球是否重复

            if(isUsed[red] == true){

                continue;

            }

            //将选中的红球存放到结果中

            result[length++] = balls[red];

            //如果等于6则说明已经生成了6个红球了，跳出循环

            if(length == 6){

                break;

            }

            //将生成的红球所对应的数组下标标记为true

            isUsed[red] = true;

        }

        //将数组排序

        Arrays.sort(result);

        //生成0~15的随机数,将随机数作为数组下标,取得蓝球

        int blue = r.nextInt(16);

        //将红球打印

        System.out.print("红球：");

        for(int i=0; i<result.length; i++){

            if(i == result.length - 1){

                System.out.print(result[i]);

            }else{

                System.out.print(result[i] + ",");

            }

        }

        //将蓝球打印

        System.out.print(" 蓝球：" + balls[blue]);

    }

}