Here you can find the source of toStream(Iterator
public static <T> Stream toStream(Iterator<T> iter, boolean parallel)
//package com.java2s; /*// w w w.ja v a 2 s . co m * Copyright (C) 2016 Chan Chung Kwong <1m02math@126.com> * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.*; import java.util.stream.*; public class Main { public static <T> Stream toStream(Iterator<T> iter, boolean parallel) { return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iter, Spliterator.ORDERED), parallel); } public static IntStream toStream(PrimitiveIterator.OfInt iter, boolean parallel) { return StreamSupport.intStream(Spliterators.spliteratorUnknownSize(iter, Spliterator.ORDERED), parallel); } public static LongStream toStream(PrimitiveIterator.OfLong iter, boolean parallel) { return StreamSupport.longStream(Spliterators.spliteratorUnknownSize(iter, Spliterator.ORDERED), parallel); } public static DoubleStream toStream(PrimitiveIterator.OfDouble iter, boolean parallel) { return StreamSupport.doubleStream(Spliterators.spliteratorUnknownSize(iter, Spliterator.ORDERED), parallel); } }