Here you can find the source of isCollection(Object value)
private static boolean isCollection(Object value)
//package com.java2s; /*/*from ww w . ja va 2 s.c om*/ * Copyright 2016 Google Inc. All Rights Reserved. * * 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; public class Main { /** * Returns {@code true} if {@code value} is either a collection or an array; {@code false} * otherwise. */ private static boolean isCollection(Object value) { return value == null ? false : value instanceof Collection<?> || value.getClass().isArray(); } }