随机生成20个手机号，待完善-白红宇

随机生成20个手机号，待完善

阅读量：5303 次

发布时间：2019-06-14

本文共 1632 字，大约阅读时间需要 5 分钟。

1 package com.homework; 2  3 import java.util.HashSet; 4 import java.util.Set; 5  6 public class RandomPhone { 7     //初始化手机前三位 8     static String[] First = {"139","138","137","136","135","134","159","158","157",  9             "150","151","152","188","130","131","132","156","135","133","153","189"};10     //手机号唯一 无序11     static Set
     
       phoneSet = new HashSet
      
       ();12     //static Set
       
         phoneSet = new HashSet
        
         ();13     14     //getNumber方法来获得数字15     public static int getNumber(int start,int end) {16         int sum = (int)(Math.random()*(end+1-start)+start);17         return sum;18     }19     public static void main(String[] args) {20         String first = null;21         String second = null;22         String third = null;23         24         25         26         for(;phoneSet.size() <20;) {27             //手机号前三位28             int index  = getNumber(0,First.length-1);29             first  = First[index];30             // substring 的作用是从指定位置开始字符串31             //生成手机剩下的8位号码32             second = String.valueOf(getNumber(0,99999)+100000);33             third = String.valueOf(getNumber(0,999)+1000);34 //            second = String.valueOf(getNumber(0,99999)+100000).substring(0);35 //            third = String.valueOf(getNumber(0,999)+1000).substring(0);36             String ch = first+second+third;37             phoneSet.add(ch);38         }39         int i = 0;40         for(String sc :phoneSet) {41             System.out.println("第"+(++i)+"的手机号是"+sc);42         }43     }44 }