public static void main(String[] args) {//手机号:1开头,长度11位的纯数字Scanner sc = new Scanner(System.in);System.out.println("请输入手机号:");String tel = sc.next();char c = tel.charAt(0);if(c == '1'){int len = tel.length();if(len == 11){for(int i = 1;i <= len - 1;i++){char t = tel.charAt(i);if(t < '0' || t > '9'){System.out.println("手机号必须都是数字");break;}else{if(i == len - 1){System.out.println("正确");}}}}else{System.out.println("手机号长度必须是11位");}}else{System.out.println("手机号必须是1开头");}}
300字范文,内容丰富有趣,生活中的好帮手!