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