字符串出现的次数

/***
 * 计算字符串在某串中出现的次数
 * @param source 某串
 * @param word 计算次数的字符
 * @return
 */
public static int getWordCount(String source, String word) {
    int count = 0;
    int start;
    while ((start = source.indexOf(word)) != -1) {
        count++;
        source = source.substring(start + word.length());
    }
    return count;
}