Java tutorial
//package com.java2s; /* * jPOS Project [http://jpos.org] * Copyright (C) 2000-2012 Alejandro P. Revilla * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { /** * Return true if the string represent a number * in the specified radix. * <br><br> **/ public static boolean isNumeric(String s, int radix) { int i = 0, len = s.length(); while (i < len && Character.digit(s.charAt(i), radix) > -1) { i++; } return (i >= len && len > 0); } }