Here you can find the source of coalesce(E... objects)
private static <E> E coalesce(E... objects)
//package com.java2s; /*//from ww w .j a v a2 s. c o m * Copyright 2013 Cloudera Inc. * * 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. */ public class Main { /** * Returns the first non-null object that is passed in. */ private static <E> E coalesce(E... objects) { for (E object : objects) { if (object != null) { return object; } } return null; } }