如何在java中添加2个文本文件的内容

File file1 = new File("path/to/file1.txt");
File file2 = new File("path/to/file2.txt");

try (BufferedReader reader1 = new BufferedReader(new FileReader(file1));
     BufferedReader reader2 = new BufferedReader(new FileReader(file2))) {
    String line;
    while ((line = reader1.readLine()) != null) {
        // 逐行处理file1.txt的内容
        // ...
    }
    while ((line = reader2.readLine()) != null) {
        // 逐行处理file2.txt的内容
        // ...
    }
} catch (IOException e) {
    e.printStackTrace();
}

List<String> combinedLines = new ArrayList<>();
while ((line = reader1.readLine()) != null) {
    combinedLines.add(line);
}
while ((line = reader2.readLine()) != null) {
    combinedLines.add(line);
}

File outputFile = new File("path/to/output.txt");
try (BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile))) {
    for (String line : combinedLines) {
        writer.write(line);
        writer.newLine();
    }
} catch (IOException e) {
    e.printStackTrace();
}