Is there a better way to read from a process's inputstream and then handle using specified methods?

Question

I am writing a program doing the following works:

1. Run a command using ProcessBuilder (like "svn info" or "svn diff");
2. Read the output of the command from the process's getInputStream();
3. With the output of the command, I want either:
   • Parse the output and get what I want and use it later, OR:
   • Write the output directly to a specified file.

Now what I am doing is using BufferedReader to read whatever the command outputs by lines and save them to an ArrayList, and then decide if I would just scan the lines to find out something or write the lines to a file.

Obviously this is an ugly implement because the ArrayList should not be needed if I want a command's output to be saved to a file. So what will you suggest, to do it in a better way?

Here is some of my codes:

Use this to run command and read from the output of the process

private ArrayList<String> runCommand(String[] command) throws IOException {
    ArrayList<String> result = new ArrayList<>();
    _processBuilder.command(command);

    Process process = null;
    try {
        process = _processBuilder.start();
        try (InputStream inputStream = process.getInputStream();
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader)) {
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                result.add(line);
            }
        }
    }
    catch (IOException ex) {
        _logger.log(Level.SEVERE, "Error!", ex);
    }
    finally {
        if (process != null) {
            try {
                process.waitFor();
    }
            catch (InterruptedException ex) {
                _logger.log(Level.SEVERE, null, ex);
            }
        }
    }

return result;
}

and in one method I may do like this:

ArrayList<String> reuslt = runCommand(command1);

for (String line: result) {
    // ...parse the line here...
}

and in another I may do like this:

ArrayList<String> result = runCommand(command2);
File file = new File(...filename, etc...);

try (PrintWriter printWriter = new PrintWriter(new FileWriter(file, false))) {
    for (String line: result) {
        printWriter.println(line);
    }
}