如何在java语言中使用HashMaps从两个单独的文本文件中删除相同的单词？

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;

public static HashMap<String, Integer> readTextFile(String filePath) {
    HashMap<String, Integer> wordMap = new HashMap<>();
    try {
        BufferedReader reader = new BufferedReader(new FileReader(filePath));
        String line;
        while ((line = reader.readLine()) != null) {
            String[] words = line.split(" ");
            for (String word : words) {
                if (wordMap.containsKey(word)) {
                    wordMap.put(word, wordMap.get(word) + 1);
                } else {
                    wordMap.put(word, 1);
                }
            }
        }
        reader.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return wordMap;
}

public static void removeDuplicateWords(String file1, String file2) {
    HashMap<String, Integer> wordMap1 = readTextFile(file1);
    HashMap<String, Integer> wordMap2 = readTextFile(file2);
    
    for (String word : wordMap1.keySet()) {
        if (wordMap2.containsKey(word)) {
            wordMap1.remove(word);
            wordMap2.remove(word);
        }
    }
    
    System.out.println("删除相同单词后的文本1：");
    for (String word : wordMap1.keySet()) {
        System.out.println(word);
    }
    
    System.out.println("删除相同单词后的文本2：");
    for (String word : wordMap2.keySet()) {
        System.out.println(word);
    }
}

public static void main(String[] args) {
    String file1 = "file1.txt";
    String file2 = "file2.txt";
    removeDuplicateWords(file1, file2);
}