Java 检查数组是否包含项。

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/* Copyright 2005-2006 Tim Fennell

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 *

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 * Licensed under the Apache License, Version 2.0 (the "License");

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 * you may not use this file except in compliance with the License.

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 * You may obtain a copy of the License at

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 *

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 *     http://www.apache.org/licenses/LICENSE-2.0

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 *

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 * Unless required by applicable law or agreed to in writing, software

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 * distributed under the License is distributed on an "AS IS" BASIS,

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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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 * See the License for the specific language governing permissions and

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 * limitations under the License.

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 */

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//package com.nowjava;/*来 自 nowjava*/

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public class Main {

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    public static void main(String[] argv) {

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

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

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        Object item = "nowjava.com";

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        System.out.println(contains(arr, item));

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    }

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    /**

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     * Checks to see if an array contains an item. Works on unsorted arrays. If the array is

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     * null this method will always return false.  If the item is null, will return true if the

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     * array contains a null entry, false otherwise.  In all other cases, item.equals() is used

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     * to determine equality.

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     *

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     * @param arr the array to scan for the item.

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     * @param item the item to be looked for

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     * @return true if item is contained in the array, false otherwise

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     */

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    public static boolean contains(Object[] arr, Object item) {

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        if (arr == null)

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            return false;

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            /** from 

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