Here you can find the source of isEmpty(final Collection> collection)
public static boolean isEmpty(final Collection<?> collection)
//package com.java2s; //License from project: Open Source License import java.util.Collection; public class Main { public static boolean isEmpty(final Collection<?> collection) { if (null == collection) { return true; } else {/* w w w.j a va 2 s .com*/ return collection.isEmpty(); } } public static boolean isEmpty(Object[] objects) { return (objects == null || objects.length == 0) ? true : false; } }