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Java 返回给定数组中元素的索引。

欢马劈雪

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返回给定数组中元素的索引。

实例源码：

源代码：

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/*******************************************************************************

* 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.

******************************************************************************/
 /** from 
 时代Java - nowjava.com**/

//package com.nowjava;

public class Main {

public static void main(String[] argv) throws Exception {

Object[] array = new String[] { "1", "abc", "level", null,

"nowjava.com", "asdf 123" };

Object element = "nowjava.com";

System.out.println(indexOf(array, element));

}

/**

* Returns the index of an element in a given array.

* @param array the element array

* @param element the element to be looked for in the array.

* @return the index of the given element in the array, or -1 if the element could not be found.

public static int indexOf(Object[] array, Object element) {

if (array == null) {

throw new NullPointerException("Null array");

}
        /**
         * nowjava 提 供 
        **/

if (element == null) {

for (int i = 0; i < array.length; i++) {

if (array[i] == null) {

return i;

}

} else {

if (element instanceof String && array instanceof String[]) {

for (int i = 0; i < array.length; i++) {

String e = String.valueOf(array[i]);
/**代码未完, 请加载全部代码(NowJava.com).**/

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

实例源码

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