Here you can find the source of indexOf(int n, int[] array)
public static int indexOf(int n, int[] array)
//package com.java2s; /**/*from w w w .j ava 2 s . c o m*/ * RxDroid - A Medication Reminder * Copyright (C) 2011-2014 Joseph Lehner <joseph.c.lehner@gmail.com> * * * RxDroid 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. Additional terms apply (see LICENSE). * * RxDroid 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 RxDroid. If not, see <http://www.gnu.org/licenses/>. * * */ public class Main { public static <T> int indexOf(T e, T[] array) { for (int i = 0; i != array.length; ++i) { if (array[i].equals(e)) return i; } return -1; } public static int indexOf(int n, int[] array) { for (int i = 0; i != array.length; ++i) { if (array[i] == n) return i; } return -1; } }