使用Java中的命令行工具进行通信

我想从我的Java程序中使用linux命令行工具.我启动程序并使用Process类(http://download.oracle.com/javase/6/docs/api/java/lang/Process.html)获取输出：

 /* @param args
  * @throws IOException 
  */
 public static void main(String[] args) throws IOException {
    Process proc = Runtime.getRuntime().exec("octave");

    BufferedReader reader = 
        new BufferedReader(new InputStreamReader(proc.getInputStream()));

    BufferedReader errorReader = 
        new BufferedReader(new InputStreamReader(proc.getInputStream()));

    BufferedWriter writer = 
        new BufferedWriter(new OutputStreamWriter(proc.getOutputStream()));

    int c;
    while((c = proc.getInputStream().read()) != -1) {
       System.out.print((char)c);
    }
    System.out.println("End");
 }

我得到以下输出：

GNU Octave,version 3.0.5 Copyright
(C) 2008 John W. Eaton and others.
This is free software; see the source
code for copying conditions. There is
ABSOLUTELY NO WARRANTY; not even for
MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. For details,type
`warranty’.

Octave was configured for
“i486-pc-linux-gnu”.

Additional information about Octave is
available at 07001.

Please contribute if you find this
software useful. For more information,
visit
07002

Report bugs to (but
first,please read
07003 to
learn how to write a helpful report).

For information about changes from
previous versions,type `news’.

奇怪的是,如果我在终端中运行八度音程,则正常输出如下：

:~/workspace/Console/src/c$octave
GNU Octave,version 3.0.5
Copyright (C) 2008 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. For details,type `warranty’.

Octave was configured for “i486-pc-linux-gnu”.

Additional information about Octave is available at 07001.

Please contribute if you find this software useful.
For more information,visit 07002

Report bugs to (but first,please read
07003 to learn how to write a helpful report).

For information about changes from previous versions,type `news’.

octave:1>

因此,请求输入的行中的字符不会在我的输入流中发送.为什么？是否可以检测是否请求输入？

谢谢你的回答！

海因里希