java如何统计一个字符串中有多少个单词呢？

实现思路:
    依次遍历字符串中字符的个数，然后判断是否为一个单词
	当是单词时，则单词个数加1

public static int countWords(String s){
    int wordCount = 0;
    boolean word = false;
    int endOfLine = s.length() - 1;
    for (int i = 0; i < s.length(); i++) {
        // if the char is a letter, word = true.
        if (Character.isLetter(s.charAt(i)) && i != endOfLine) {
            word = true;
            // if char isn't a letter and there have been letters before,
            // counter goes up.
        } else if (!Character.isLetter(s.charAt(i)) && word) {
            wordCount++;
            word = false;
            // last word of String; if it doesn't end with a non letter, it
            // wouldn't count without this.
        } else if (Character.isLetter(s.charAt(i)) && i == endOfLine) {
            wordCount++;
        }
    }
    return wordCount;
}