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 is blank filled (space char filled) */ public static boolean isBlank(String s) { return (s.trim().length() == 0); } /** * trim String (if not null) * @param s String to trim * @return String (may be null) */ public static String trim(String s) { return s != null ? s.trim() : null; } /** * Trims a byte[] to a certain length * @param array the byte[] to be trimmed * @param length the wanted length * @return the trimmed byte[] */ public static byte[] trim(byte[] array, int length) { byte[] trimmedArray = new byte[length]; System.arraycopy(array, 0, trimmedArray, 0, length); return trimmedArray; } }