Here you can find the source of isNotEmptyOrNull(Collection> collection)
public static boolean isNotEmptyOrNull(Collection<?> collection)
//package com.java2s; //License from project: Apache License import java.util.Collection; import java.util.Map; public class Main { public static boolean isNotEmptyOrNull(Collection<?> collection) { return null != collection && !collection.isEmpty(); }/*from ww w .j a v a 2s. c o m*/ public static boolean isEmpty(Collection<?> collection) { return (collection == null || collection.isEmpty()); } public static boolean isEmpty(Map<?, ?> map) { return (map == null || map.isEmpty()); } }