java如何在另一个字符串中搜索字符串

Question

我正在尝试创建一个程序，它将能够搜索用户输入的字符串中的特定单词，并计算该单词的重复次数

例如，我希望程序的功能如下：

Please enter a string of your choice:

kelowna is a nice city, kelowna is my home.

Enter a word for which you would like to search for:

kelowna

The word Kelowna was found 2 times.

我该怎么做呢？我最初的方法是使用循环，但这并没有让我走得太远

这就是我目前的情况：

import java.util.Scanner;

public class FinalPracc {
    public static void main(String[] args) {
        Scanner s1 = new Scanner(System.in);
        System.out.println("please enter a string of you choice: ");
        String a = s1.nextLine();
        System.out.println("Please enter the word you would like to search for: ");
        String b = s1.nextLine();

        int aa = a.length();
        int bb = b.length();

        if (a.contains(b)) {
            System.out.println("word found");
            int c = a.indexOf(b);
            int
            if (
        }
    }
    /* ADD YOUR CODE HERE */
}