java 计算指定字符串中目标字符串出现的次数

public static void findCount(String src, String des) {
        int index = 0;
        int count = 0;
        while ((index = src.indexOf(des, index)) != -1) {
            count++;
            index = index + des.length();
        }
        System.out.println(des + "出现了 " + count + " 次");
    }

src指定字符串    des目标字符串