Here you can find the source of toIntArray(final List extends Number> numbers)
static int[] toIntArray(final List<? extends Number> numbers)
//package com.java2s; /*// ww w . j a v a 2s.c o m * Copyright 2004-2005 Revolution Systems Inc. * * 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.List; public class Main { static int[] toIntArray(final List<? extends Number> numbers) { final int[] ints = new int[numbers.size()]; for (int i = 0; i < ints.length; i++) { final Number number = numbers.get(i); ints[i] = number.intValue(); } return ints; } }