Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static boolean checkNumber(String username) {

        Pattern pattern = Pattern.compile("^[0-9]+$");
        Matcher matcher = pattern.matcher(username);
        return matcher.matches();
    }
}