如何使用Java对文本文件中的记录进行排序？

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public List<String> readLines(String filePath) throws IOException {
    List<String> lines = new ArrayList<>();
    BufferedReader bufferedReader = new BufferedReader(new FileReader(filePath));
    String line;
    while ((line = bufferedReader.readLine()) != null) {
        lines.add(line);
    }
    bufferedReader.close();
    return lines;
}

import java.util.Collections;
import java.util.List;

public void sortLines(List<String> lines) {
    Collections.sort(lines);
}

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;

public void writeLines(String filePath, List<String> lines) throws IOException {
    BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(filePath));
    for (String line : lines) {
        bufferedWriter.write(line);
        bufferedWriter.newLine();
    }
    bufferedWriter.close();
}

public static void main(String[] args) {
    String filePath = "input.txt";
    String outputFilePath = "output.txt";

    try {
        List<String> lines = readLines(filePath);
        sortLines(lines);
        writeLines(outputFilePath, lines);
    } catch (IOException e) {
        e.printStackTrace();
    }
}