Help for getting output of Runtime.getRuntime().exec()

[divya g nair]

I have executed the following command to compile a java program.
Runtime.getRuntime().exec("cmd/c start C:/jdk1.4/BIN/javac filename.java");
i got the class files if there is no errors. But I want to read the errorlist if there any.
My code is like this Anyone can help me please.

try { 
    String line; 
    Process p = Runtime.getRuntime().exec("cmd/C start C:/jdk1.4/BIN/javac ssh1.java"); 
    BufferedReader input = new BufferedReader (new InputStreamReader(p.getInputStream())); 
    while ((line = input.readLine()) != null) { 
        System.out.println(line); 
    } 
    input.close(); 
} 
catch (Exception err) { 
    err.printStackTrace(); 
} 

thanks in advance

[Ulf Dittmer]

You may want to read in this article to learn about all the issues you need to be aware of when dealing with Runtime.exec.

[Campbell Ritchie]

Please use the CODE button, and maintain indentation.

Use of Runtime.exec() is slightly easier since the introduction of the ProcessBuilder class, but nobody should go near Runtime.exec() without reading the article Ulf quoted.