有这样一句话“I have a dog,I love dog,dog is my friend”,请用java编写一个方

咱们就用最简单最直观的吧
public static void main(String[] args) {
x05x05String content = "I have a dog,I love dog,dog is my friend";
x05x05getDogNums(content);
x05x05System.out.println(mNums);
x05}
x05
x05static int mNums;
x05public static void getDogNums(String str) {
x05x05int index = str.indexOf("dog");
x05x05if (index != -1) {
x05x05x05mNums++;
x05x05x05getDogNums(str.substring(index+1));
x05x05}
x05}