DISPLAY variable

Hello,

Can someone please tell me if there is a way of setting
X11GraphicsEnvironment.initDisplay at runtime ?

Currently, I've managed doing :-

System.setProperty("DISPLAY", "<my IP address>:0.0");
System.out.println("Jar DISPLAY = [" + System.getProperty("DISPLAY") + "]\n");

But I need to actually go to the lowest possible level of Java and set the DISPLAY variable there ?

Thanks.