当需要输入时，从缓冲读取器循环中读取输出停止

Question

我正在制作一个自动测试CLI的程序。我遇到的一个部分是从命令行读取输出。我的代码如下所示：

private static File createTempScript(List<String> commands) throws IOException {
    final File tempScript = File.createTempFile("script", null);

    final Writer streamWriter = new OutputStreamWriter(new FileOutputStream(
            tempScript));
    final PrintWriter printWriter = new PrintWriter(streamWriter);

    for(String command: commands) {
        printWriter.println(command);
    }


    printWriter.close();

    return tempScript;
}

/**
 * Takes in a list of commands that then get sent to make a script. After the script is created this method will
 * then run the script.
 */
public void executeCommand(List<String> commands) throws IOException {

    final File tempScript = createTempScript(commands);

        final ProcessBuilder pb = new ProcessBuilder("bash", tempScript.toString());
        final Process process = pb.start();
        final BufferedReader in = new BufferedReader(new
                InputStreamReader(process.getInputStream()));
    final BufferedReader out = new BufferedReader(new
            InputStreamReader(process.getInputStream()));
        String s;
        while ((s = in.readLine()) != null) {
            if(!s.isEmpty())
            {
                Output.add(s);
            }
        }
}

我现在遇到的问题是，在while循环中，只要它到达我需要在命令中输入的行，程序就会挂起。每当我注释掉那个循环时，程序运行正常。

感谢您的帮助。