如何计算ArrayList中元素的单次出现次数？

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class ArrayListElementCount {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("apple");
        list.add("banana");
        list.add("apple");
        list.add("orange");
        list.add("banana");

        Map<String, Integer> countMap = new HashMap<>();
        for (String element : list) {
            if (countMap.containsKey(element)) {
                int count = countMap.get(element);
                countMap.put(element, count + 1);
            } else {
                countMap.put(element, 1);
            }
        }

        for (Map.Entry<String, Integer> entry : countMap.entrySet()) {
            System.out.println(entry.getKey() + " 出现次数: " + entry.getValue());
        }
    }
}