Java tutorial
//package com.java2s; //License from project: Apache License import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static boolean isNumeric(String str) { if ("".equals(str)) return false; Pattern pattern = Pattern.compile("[0-9]*"); Matcher isNum = pattern.matcher(str); if (!isNum.matches()) { return false; } return true; } }