A Question about java public class Q1Ox { /** * Given an ox word, return the number of 'x's in the ox word, or return -1 * if the word is not an ox word, and 0 if the word is an empty string. * * An ox word: a) is composed only of 'o's and 'x's, b) has more 'x's than * 'o's, and c) the leading N-1 letters of an ox word must also be an ox word. * * For example: x is an ox word, but o is not. All words that start with o, * such as oxxx, are therefore not ox words. xo is not an ox word because * it does not have more x's than o's. All words that start with xo are * therefore not ox words. Thus xox, xoo, oxx, oxo, oox, * and ooo are not ox words. However, xxx and xxo are both ox words because * they have more x's than o's and the left N-1 letters are xx, which is an * ox word. * * @param word A word * @return the number of 'x's in the word if the word is an ox word (see * above), 0 if it is and empty string, and -1 if it is not an ox word. */ public static int ox(String word) { return -1; // FIXME complete this method } }