Java语言怎么编写文件整理功能

import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class FileSorter {
    public static void main(String[] args) {
        try {
            // 读取文件内容
            List<String> lines = readFile("input.txt");

            // 对文件内容进行排序
            sortLines(lines);

            // 将排序后的文件内容写入新文件
            writeFile("output.txt", lines);

            System.out.println("文件整理完成！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 读取文件内容
    private static List<String> readFile(String filename) throws IOException {
        List<String> lines = new ArrayList<>();

        try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
            String line;
            while ((line = br.readLine()) != null) {
                lines.add(line);
            }
        }

        return lines;
    }

    // 对文件内容进行排序
    private static void sortLines(List<String> lines) {
        Collections.sort(lines);
    }

    // 将排序后的文件内容写入新文件
    private static void writeFile(String filename, List<String> lines) throws IOException {
        try (BufferedWriter bw = new BufferedWriter(new FileWriter(filename))) {
            for (String line : lines) {
                bw.write(line);
                bw.newLine();
            }
        }
    }
}