problem with stIcon()

Hi,

I am developing an application which needs to dynamically show whether a host is up or down.I have used buttons on which i am pasting the icon indicating up or down.So, when a node is down, I am replacing the icon that indicates up with the icon that indicates down using setIcon() function.But instead of changing the icon a NullPointerException is generated.For example,

private JButton c1;

JButton c1 = new JButton();

Icon bug = new ImageIcon("image/coms1.gif");//this image is for up

Icon bug3= new ImageIcon("image/computer.gif");//for down

c1.setIcon(bug);

if(node is down)

c1.setIcon(bug3);

Thanks for any help.

jerico

[697 byte] By [Rajkhowaa] at [2007-10-3 9:38:06]