生成指定范围不重复的随机数

题目:生成1-10范围中任意5个随机数。

方法一:不使用容器

 1 package com.study.pratice03;
 2 
 3 import java.util.Random;
 4 
 5 public class MyRandom
 6 {
 7 
 8     public static void main(String[] args)
 9     {
10         // TODO Auto-generated method stub
11         int[] randArray = new int[5];
12         int randInt = 0;// 产生的随机数
13         int count = 0;// 产生合格随机数的个数
14         boolean flag = false;// 标记产生的随机数是否重复
15         Random rand = new Random();
16         while (count < 5)
17         {
18             randInt = rand.nextInt(11);
19             for (int i = 0; i < count; i++)
20             {
21                 if (randArray[i] == randInt)
22                 {
23                     flag = true;
24                     break;
25                 }
26                 else
27                 {
28                     flag = false;
29                 }
30             }
31             if (!flag && randInt != 0)
32             {
33                 randArray[count++] = randInt;
34             }
35         }
36         for (int x : randArray)
37             System.out.println(x);
38 
39     }
40 
41 }

方法二:使用容器

View Code

 1 package com.study.pratice03;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 import java.util.Random;
 6 
 7 public class SetRandom
 8 {
 9 
10     public static void main(String[] args)
11     {
12         // TODO Auto-generated method stub
13         List<Integer> list = new ArrayList<Integer>();
14         Random rd = new Random();
15         int count = 0;
16         while (count < 5)
17         {
18             int randInt = rd.nextInt(11);
19             if (randInt != 0 && !list.contains(randInt))
20             {
21                 list.add(randInt);
22                 count++;
23             }
24         }
25         for (Integer inte : list)
26             System.out.println(inte);
27     }
28 }