Here you can find the source of assertNotEmptyString(final String s)
static void assertNotEmptyString(final String s)
//package com.java2s; /*//from ww w . j av a 2 s . co m * Copyright (c) 2013, FOSS Nova Software foundation (FNSF), * and individual contributors as indicated by the @author tags. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ public class Main { static void assertNotEmptyString(final String s) { if ("".equals(s)) { throw new IllegalArgumentException("Method parameter cannot be empty string"); } } }