如何在java中将多个文件合并成另一个新文件？

import java.io.*;

public class FileMerger {
    public static void mergeFiles(String[] filePaths, String newFilePath) {
        try {
            File newFile = new File(newFilePath);
            FileOutputStream fos = new FileOutputStream(newFile);

            for (String filePath : filePaths) {
                File file = new File(filePath);
                FileInputStream fis = new FileInputStream(file);
                BufferedInputStream bis = new BufferedInputStream(fis);

                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = bis.read(buffer)) != -1) {
                    fos.write(buffer, 0, bytesRead);
                }

                bis.close();
                fis.close();
            }

            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String[] filePaths = {"file1.txt", "file2.txt", "file3.txt"};
        String newFilePath = "mergedFile.txt";
        mergeFiles(filePaths, newFilePath);
    }
}