[0729] operations randomly generated 20 phone numbers

Requirements: twenty randomly generated phone numbers

 1 package com.random;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Phone {
 6     static Scanner sc = new Scanner(System.in);
 7     public static void getPhoneNum() {
 8         //设置手机号初始前三位
 9         String[] Top3 = {"133", "149", "153", "173", "177",
10                 "180", "181", "189", "199", "130", "131", "132",
11                 "145", "155", "156", "166", "171", "175", "176", "185", "186", "166", "134", "135",
12                  , "136", "137", "138", "139", "147", "150", "151", "152", "157", "158", "159", "172" ,
 13                  "178", "182", "183", "184", "187", "188", "198", "170", "171" };
 14  
15          // random real number section illustrating the use of an array length properties, to obtain the array length,
 16          // () * the array length by array subscript Math.random obtained, whereby a random number section in the top three 
. 17          String firstNum Top3 = [( int ) (Math.random () * Top3.length )];
 18          // random the remaining 8 bits 
. 19          String = lastNum "";
20         final int last = 8;
21         for (int0 = I; I <Last; I ++ ) {
 22 is              // each cycle selected from 0 to 9, a random number 
23 is              lastNum + = ( int ) (Math.random () * 10 );
 24          }
 25          // finally number mantissa segment connecting and 
26 is          String phoneNum + = firstNum lastNum;
 27          System.out.println (phoneNum);
 28      }
 29      
30  
31 is      public  static   void main (String [] args) {
 32          // generate twenty phone number 
33 is          int 20 is = NUM ;
 34 is          System.out.println ( "phone number as follows:" );
35         for (int i = 0; i < num; i++) {
36             getPhoneNum();
37         }
38     }
39 }