Here you can find the source of isCollectionEmpty(Collection collection)
public static boolean isCollectionEmpty(Collection collection)
//package com.java2s; /*/*from w w w . ja v a2 s .com*/ * Created by Gigigo Android Team * * Copyright (C) 2016 Gigigo Mobile Services SL * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Collection; import java.util.Iterator; public class Main { public static boolean isCollectionEmpty(Collection collection) { boolean isEmpty = true; Iterator iterator = collection.iterator(); while (iterator.hasNext() && isEmpty) { Object object = iterator.next(); if (object != null) { isEmpty = false; } } return isEmpty; } }