如何在Java中将文件中的第一个单词与最后一个单词互换？

import java.io.*;

public class FileWordSwap {
    public static void main(String[] args) {
        try {
            // 读取文件内容
            FileReader fileReader = new FileReader("input.txt");
            BufferedReader bufferedReader = new BufferedReader(fileReader);
            String content = bufferedReader.readLine();
            bufferedReader.close();

            // 分割字符串
            String[] words = content.split(" ");

            // 交换单词位置
            String temp = words[0];
            words[0] = words[words.length - 1];
            words[words.length - 1] = temp;

            // 重新组合字符串
            StringBuilder result = new StringBuilder();
            for (String word : words) {
                result.append(word).append(" ");
            }

            // 将结果写入文件
            FileWriter fileWriter = new FileWriter("output.txt");
            BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
            bufferedWriter.write(result.toString().trim());
            bufferedWriter.close();

            System.out.println("单词位置互换成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}