用java编写一个模拟电话簿 java生成手机号

public static int getNum(int start,int end) {
      return (int)(Math.random()*(end-start+1)+start);
  }

  /**
   * 返回手机号码 
   */
  private static String[] telFirst="134,135,136,137,138,139,150,151,152,157,158,159,130,131,132,155,156,133,153".split(",");
  private static String getTel() {
      int index=getNum(0,telFirst.length-1);
      String first=telFirst[index];
      String second=String.valueOf(getNum(1,888)+10000).substring(1);
      String third=String.valueOf(getNum(1,9100)+10000).substring(1);
      return first+second+third;
  }