Here you can find the source of toPrimitiveIntArray(List> values)
public static Object toPrimitiveIntArray(List<?> values)
//package com.java2s; /* Copyright (c) 2006 Pyxis Technologies inc. * //from w ww . j a v a 2 s .c o m * This 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 2 of the License, or (at your option) any later * version. * * This software 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, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF site: * http://www.fsf.org. */ import java.util.List; public class Main { public static Object toPrimitiveIntArray(List<?> values) { int[] array = new int[values.size()]; int cursor = 0; for (Object o : values) { array[cursor] = (Integer) o; cursor++; } return array; } }