hi all ! does anyone know how to open up the window of a normal program from a graphics window in Blue J

You can run (almost) any other program from Java via the ProcessBuilder class. Eg

    ProcessBuilder pb = new ProcessBuilder("notepad.exe", "sometestdata.txt");
    try {
        pb.start();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

There are loads of other options - eg to send input via the programs stdin, and to capture its stdout if you want. See
http://docs.oracle.com/javase/7/docs/api/java/lang/ProcessBuilder.html