*验证

package cn.check.com;

import java.util.Scanner;

public class CheckPhoneDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入:");
        String phone=sc.nextLine();
        
           String regex="1[38]\d{9}";//首个数字为1,第二个数字是3或者8,//d是0-9的数字,{9}后面还有9位数字
          boolean flag= phone.matches(regex);
          System.out.println(flag);
    }

}