Changing the coffee cup Icon in Titlebar?

HI
I read all thrads about this but still dont get it working. I tried it 3 ways:
1:
ImageIcon pic = new ImageIcon("pic.gif");
this.setIconImage(pic.getimage());
I call this function in the constructor of the frame Object. Pic is in same folder as the class. Frame appears but NO icon is shown (just blue Titlebar)
2:
this.setIconImage( new ImageIcon( Classloader.getSystemResource("pic.gif")).getImage());
brings up a NULL pointer Error :(
3:
this.setIconImage(Toolkit.getDefaultToolkit().getImage(packetName + "pic.gif"));
where packetName is the full packet path.
this on e also gets me an NULL pointer Error.
I dont know what to do anymore. Please help! THanks!

2. this.setIconImage( new ImageIcon( Classloader.getSystemResource("pic.gif")).getImage());
This is the best thing to do if you don't know where your classes will be installed. Put your image in your classpath and you're done. If it didn't work for you then it may be because your class is in a package. Here's what I do:
setIconImage(new ImageIcon(this.getClass().getResource("/pic.gif").getImage());
Note the slash at the beginning of the file name. If my class is named com.hoser.SuperGUI, then it will be in a directory named .../something/com/hoser. I put the pic.gif file in the .../something directory, which would be one of the directories in my classpath, and the getResource() method finds it there.
If I left off the slash, then getResource() would be looking in my classpath for com/hoser/pic.gif, and in that case I would have to put the file into the .../something/com/hoser directory.

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Changing the coffee cup Icon in Titlebar?

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