覆盖文本文件中的特定行？

import fileinput

for line in fileinput.input("file.txt", inplace=True):
    if fileinput.filelineno() == 3:
        print("新的内容")
    else:
        print(line, end="")

const fs = require("fs");

const data = fs.readFileSync("file.txt", "utf8").split("\n");
data[2] = "新的内容";
fs.writeFileSync("file.txt", data.join("\n"));

import java.io.*;

public class Main {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new FileReader("file.txt"));
            BufferedWriter bw = new BufferedWriter(new FileWriter("temp.txt"));

            String line;
            int lineNumber = 0;
            while ((line = br.readLine()) != null) {
                lineNumber++;
                if (lineNumber == 3) {
                    bw.write("新的内容");
                } else {
                    bw.write(line);
                }
                bw.newLine();
            }

            br.close();
            bw.close();

            File originalFile = new File("file.txt");
            File newFile = new File("temp.txt");
            originalFile.delete();
            newFile.renameTo(originalFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}