Swing/AWT/SWT :: Closing Another Application Using Java Code

Following code I use to run or Launch another application

try {
Runtime.getRuntime().exec("rundll32 url.dll, FileProtocolHandler " + "Path of Application's EXE File");
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e, null, JOptionPane.ERROR_MESSAGE);
}

if the above code is to launch another application using java then how can I close/exit the same(another) application using java code once I press the exit button of my java app.