Get element index in an array - Android java.lang

Android examples for java.lang:array

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Description

Get element index in an array

Demo Code

/*//from ww w.j  a  v a2s.  c  o m
 * @(#)$Id: ArrayUtils.java 3619 2008-03-26 07:23:03Z yui $
 * 
 * Copyright 2006-2008 Makoto YUI
 * 
 * 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.
 * 
 * Contributors: Makoto YUI - ported from jakarta commons lang
 */
//package com.java2s;

public class Main {
    /**
     * The index value when an element is not found in a list or array: <code>-1</code>. This value is
     * returned by methods in this class and can also be used in comparisons with values returned by
     * various method from {@link java.util.List}.
     */
    public static final int INDEX_NOT_FOUND = -1;

    public static <T> int indexOf(final T[] array, final T value) {
        final int alen = array.length;
        for (int i = 0; i < alen; i++) {
            if (value.equals(array[i])) {
                return i;
            }
        }
        return INDEX_NOT_FOUND;
    }

    public static <T> int indexOf(final T[] array, final T value,
            final int startIndex) {
        final int alen = array.length;
        for (int i = startIndex; i < alen; i++) {
            if (value.equals(array[i])) {
                return i;
            }
        }
        return INDEX_NOT_FOUND;
    }

    public static int indexOf(final byte[] array, final byte valueToFind,
            int startIndex) {
        if (array == null) {
            return INDEX_NOT_FOUND;
        }
        if (startIndex < 0) {
            startIndex = 0;
        }
        for (int i = startIndex; i < array.length; i++) {
            if (valueToFind == array[i]) {
                return i;
            }
        }
        return INDEX_NOT_FOUND;
    }

    public static boolean equals(final char[] a, final char[] a2,
            final int off, final int len) {
        if (a == a2) {
            return true;
        }
        if (a == null || a2 == null) {
            return false;
        }
        int length = a.length;
        if (len != length) {
            return false;
        }
        for (int i = 0; i < len; i++) {
            if (a[i] != a2[off + i]) {
                return false;
            }
        }
        return true;
    }
}

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