如何在arraylist中找到最常用的前20个单词

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Collections;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        ArrayList<String> arrayList = new ArrayList<>();
        // 假设arrayList已经包含了一些单词
        
        List<String> top20Words = findTop20Words(arrayList);
        
        System.out.println("出现次数最多的前20个单词：");
        for (String word : top20Words) {
            System.out.println(word);
        }
    }
    
    public static List<String> findTop20Words(ArrayList<String> arrayList) {
        HashMap<String, Integer> wordCountMap = new HashMap<>();
        
        // 统计单词出现次数
        for (String word : arrayList) {
            if (wordCountMap.containsKey(word)) {
                wordCountMap.put(word, wordCountMap.get(word) + 1);
            } else {
                wordCountMap.put(word, 1);
            }
        }
        
        // 按照单词出现次数排序
        List<Map.Entry<String, Integer>> sortedList = new ArrayList<>(wordCountMap.entrySet());
        Collections.sort(sortedList, new Comparator<Map.Entry<String, Integer>>() {
            public int compare(Map.Entry<String, Integer> entry1, Map.Entry<String, Integer> entry2) {
                return entry2.getValue().compareTo(entry1.getValue());
            }
        });
        
        // 获取出现次数最多的前20个单词
        List<String> top20Words = new ArrayList<>();
        for (int i = 0; i < Math.min(20, sortedList.size()); i++) {
            top20Words.add(sortedList.get(i).getKey());
        }
        
        return top20Words;
    }
}