Here you can find the source of coalesce(T preferred, T alternative)
| Parameter | Description |
|---|---|
| T | the type of the values |
| preferred | the preferred return value |
| alternative | the alternative return value used if the preferred value is null |
public static <T> T coalesce(T preferred, T alternative)
//package com.java2s; /*//from w w w. j a va2s . c o m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 { /** * Checks whether a preferred value is valid and returns an alternative value if not. * @param <T> the type of the values * @param preferred the preferred return value * @param alternative the alternative return value used if the preferred value is null * @return the preferred value if it is not null or the alternative value otherwise */ public static <T> T coalesce(T preferred, T alternative) { return (preferred != null ? preferred : alternative); } }