是可迭代的空

//package com.nowjava;// 来 自 nowjava - 时代Java


public class Main {

    /**

     * @param i

     *          An {@link Iterable} to check.

     * @return <code>true</code> if the parameter is <code>null</code> or it has

     *         an empty item set.

     */

    public static boolean isEmpty(Iterable<?> i) {

        return i == null || !i.iterator().hasNext();

    }

}