Here you can find the source of lastIndexOf(int[] array, int valueToFind)
public static int lastIndexOf(int[] array, int valueToFind)
//package com.java2s; /*//from w w w .j ava 2s. c om * #%L * G * %% * Copyright (C) 2014 Giovanni Stilo * %% * G is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see * <https://www.gnu.org/licenses/lgpl-3.0.txt>. * #L% */ public class Main { public static int INDEX_NOT_FOUND = -1; public static int lastIndexOf(int[] array, int valueToFind) { int startIndex = array.length - 1; for (int i = startIndex; i >= 0; i--) { if (valueToFind == array[i]) { return i; } } return INDEX_NOT_FOUND; } }