JAVA獲取一個字符串在整個字符串中出現的次數

class StringCount{
    public static void main(String[] args){
        String s = "javascriptjavasejavaeejavame";
        int count = getSubString(s,"java");
        System.out.println(count);
    }
    public static int  getSubString(String str,String key){
        int count = 0;
        int index = 0;
        while((index=str.indexOf(key,index))!=-1){
            index = index+key.length();
            count++;
        }
        return count;
    }
    
}