返回可迭代包含的元素数。

/*

 * Copyright (C) 2007-2014 Crafter Software Corporation.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

//package com.nowjava;

/*来自 
 时 代 J a v a 公 众 号 - nowjava.com*/

import java.util.Iterator;


public class Main {

    /**

     * Returns the number of elements the iterable contains.

     *

     * @param iterable the iterable

     * @return the element count of the iterable

     */

    public static <T> int count(Iterable<T> iterable) {

        int count = 0;


        if (iterable != null) {

            Iterator<T> iter = iterable.iterator();