Here you can find the source of streamOf(T value)
public static <T> Stream<T> streamOf(T value)
//package com.java2s; /*//from w w w.jav a 2 s.c o m * Copyright 2015, 2016 Ether.Camp Inc. (US) * This file is part of Ethereum Harmony. * * Ethereum Harmony is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Ethereum Harmony is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Ethereum Harmony. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Optional; import java.util.stream.Stream; public class Main { /** * Stream or value or empty stream if value is null. */ public static <T> Stream<T> streamOf(T value) { return Optional.ofNullable(value).map(Stream::of).orElseGet(Stream::empty); } }