Here you can find the source of indexOf(List
public static <T> int indexOf(List<T> list, T string, int beginIndex)
//package com.java2s; /******************************************************************************* * Copyright 2011 Google Inc. All Rights Reserved. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * 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./*ww w . ja v a2 s .c o m*/ *******************************************************************************/ import java.util.List; public class Main { /** * A {@link List#indexOf(Object)} which begins the search at a particular * index. */ public static <T> int indexOf(List<T> list, T string, int beginIndex) { for (int i = beginIndex; i < list.size(); i++) { if (string.equals(list.get(i))) { return i; } } return -1; } }