连接多个文件并在文件之间添加文件名

file_names = ['file1.txt', 'file2.txt', 'file3.txt']
output_file = 'output.txt'

content = ''
for file_name in file_names:
    with open(file_name, 'r') as file:
        content += file.read() + '\n' + file_name + '\n'

with open(output_file, 'w') as file:
    file.write(content)

import java.io.*;

public class FileConcatenation {
    public static void main(String[] args) {
        String[] fileNames = {"file1.txt", "file2.txt", "file3.txt"};
        String outputFileName = "output.txt";

        StringBuilder content = new StringBuilder();
        for (String fileName : fileNames) {
            try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) {
                String line;
                while ((line = reader.readLine()) != null) {
                    content.append(line).append('\n').append(fileName).append('\n');
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(outputFileName))) {
            writer.write(content.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}