Here you can find the source of ToPrimitiveLongArray(List
public static long[] ToPrimitiveLongArray(List<Long> list)
//package com.java2s; /**// w w w . j a va2 s . c o m * Copyright 2012 Jason Sorensen (sorensenj@smert.net) * * 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.Iterator; import java.util.List; public class Main { public static long[] ToPrimitiveLongArray(List<Long> list) { Iterator<Long> iterator = list.iterator(); long[] array = new long[list.size()]; for (int i = 0; i < array.length; i++) { array[i] = iterator.next(); } return array; } }