如何根据JAVA的某些参数返回列表中对象的出现次数

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ObjectFrequency {
    public static void main(String[] args) {
        List<Object> list = ...; // 替换为实际的列表对象

        Map<Object, Integer> frequencyMap = new HashMap<>();

        for (Object obj : list) {
            if (frequencyMap.containsKey(obj)) {
                frequencyMap.put(obj, frequencyMap.get(obj) + 1);
            } else {
                frequencyMap.put(obj, 1);
            }
        }

        // 打印每个对象及其出现次数
        for (Map.Entry<Object, Integer> entry : frequencyMap.entrySet()) {
            System.out.println("对象：" + entry.getKey() + "，出现次数：" + entry.getValue());
        }
    }
}