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Java 返回给定数组中元素的索引。
返回给定数组中元素的索引。
实例源码：
源代码：
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/*******************************************************************************3
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* Copyright 2014 uniVocity Software Pty Ltd5
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*7
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* Licensed under the Apache License, Version 2.0 (the "License");9
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* you may not use this file except in compliance with the License.11
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* You may obtain a copy of the License at13
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*15
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* http://www.apache.org/licenses/LICENSE-2.017
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*19
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* Unless required by applicable law or agreed to in writing, software21
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* distributed under the License is distributed on an "AS IS" BASIS,23
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.25
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* See the License for the specific language governing permissions and27
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* limitations under the License.29
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******************************************************************************/31
/** from 32
时代Java - nowjava.com**/33
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//package com.nowjava;35
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public class Main {38
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public static void main(String[] argv) throws Exception {40
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Object[] array = new String[] { "1", "abc", "level", null,42
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"nowjava.com", "asdf 123" };44
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Object element = "nowjava.com";46
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System.out.println(indexOf(array, element));48
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}50
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/**53
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* Returns the index of an element in a given array.55
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* @param array the element array57
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* @param element the element to be looked for in the array.59
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*61
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* @return the index of the given element in the array, or -1 if the element could not be found.63
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*/65
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public static int indexOf(Object[] array, Object element) {67
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if (array == null) {69
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throw new NullPointerException("Null array");71
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}73
/**74
* nowjava 提 供 75
**/76
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if (element == null) {78
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for (int i = 0; i < array.length; i++) {80
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if (array[i] == null) {82
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return i;84
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}86
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}88
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} else {90
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if (element instanceof String && array instanceof String[]) {92
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for (int i = 0; i < array.length; i++) {94
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String e = String.valueOf(array[i]);96
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