Here you can find the source of isEmpty(List values)
public static boolean isEmpty(List values)
//package com.java2s; /*/*from w w w . j a v a 2 s . c o m*/ * Copyright (c) 2008, 2009, 2010, 2011 Denis Tulskiy * * This program 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 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * version 3 along with this work. If not, see <http://www.gnu.org/licenses/>. */ import java.util.List; import java.util.Set; public class Main { public static boolean isEmpty(String value) { return value == null || value.isEmpty(); } public static boolean isEmpty(List values) { return values == null || values.isEmpty(); } public static boolean isEmpty(Set values) { return values == null || values.isEmpty(); } }