Here you can find the source of isBlank(Collection> c)
public static boolean isBlank(Collection<?> c)
//package com.java2s; /******************************************************************************* * Copyright (c) 2010-2014 SAP AG and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors:/*w ww . j a v a2 s .c o m*/ * SAP AG - initial API and implementation *******************************************************************************/ import java.util.Collection; public class Main { public static boolean isBlank(Collection<?> c) { return c != null && c.isEmpty(); } }