package com.work;

import java.util.Scanner;

/**
 * @auther:：9527
 * @Description: 隨機生成電話號碼
 * @program: shi_yong
 * @create: 2019-07-30 10:22
 */
public class RandomPhoneNum {
  static Scanner sc = new Scanner(System.in);

  public static <lenPhone> void main(String[] args) {
    //詢問需要多少個隨機號碼
    boolean boo = true;
    int num = 0;
    do {
      //如果用戶輸入的不是一個整數(shù)，就循環(huán)要求用戶輸入一個整數(shù)
      System.out.println("你需要多少組電話號碼，請輸入一個整數(shù)");
      String answer = sc.next();
      try {
        //將用戶的輸入轉(zhuǎn)化為整數(shù)
        num = Integer.parseInt(answer);
        //如果轉(zhuǎn)換成功，boo就設(shè)置為false使其可以跳出循環(huán)
        boo = false;
      } catch (Exception e) {
        //如果用戶輸入的不是一個整數(shù)，就拋出異常，要求用戶重新輸入
        System.out.println("你輸入的不是一個整數(shù)，請重新輸入");
      }

    } while (boo);

    System.out.println("你要的手機號碼如下：");
    //將循環(huán)次數(shù)設(shè)置為用戶需要的號碼的數(shù)量
    for (int i = 0; i < num; i++) {
      //調(diào)用靜態(tài)方法生成手機號碼
      getPhoneNum();
    }
  }

  //定一個靜態(tài)方法，專門生成單個的號碼
  public static void getPhoneNum() {
    //給予真實的初始號段，號段是在百度上面查找的真實號段
    String[] start = {"133", "149", "153", "173", "177",
        "180", "181", "189", "199", "130", "131", "132",
        "145", "155", "156", "166", "171", "175", "176", "185", "186", "166", "134", "135",
        "136", "137", "138", "139", "147", "150", "151", "152", "157", "158", "159", "172",
        "178", "182", "183", "184", "187", "188", "198", "170", "171"};

    //隨機出真實號段  使用數(shù)組的length屬性，獲得數(shù)組長度，
    //通過Math.random（）*數(shù)組長度獲得數(shù)組下標，從而隨機出前三位的號段
    String phoneFirstNum = start[(int) (Math.random() * start.length)];
    //隨機出剩下的8位數(shù)
    String phoneLastNum = "";
    //定義尾號，尾號是8位
    final int LENPHONE = 8;
    //循環(huán)剩下的位數(shù)
    for (int i = 0; i < LENPHONE; i++) {
      //每次循環(huán)都從0~9挑選一個隨機數(shù)
      phoneLastNum += (int) (Math.random() * 10);
    }
    //最終將號段和尾數(shù)連接起來
    String phoneNum = phoneFirstNum + phoneLastNum;
    System.out.println(phoneNum);
  }
}