How to set an icon for a frame in Java?

问题

I have used this statement to set icon of a frame:

frame.setIconImage(Toolkit.getDefaultToolkit().getImage("tictactoe.gif"));

Unfortunately the frame icon still shows default java icon instead.

How to fix this?

回答1:

Check if Toolkit.getDefaultToolkit().getImage("tictactoe.gif") really reads the image. Try to split into 2 lines:

Image img = Toolkit.getDefaultToolkit().getImage("tictactoe.gif");
frame.setIconImage (img);

Then use debugger to check what is there inside img variable.

回答2:

Try with ImageIcon and let us now if it works:-). It has a simple constructor taking a path to file with icon image. After construction you can retrieve image from it by calling ImageIcon.getImage().

Maybe the image is not in the right place and cannot be found?

来源：https://stackoverflow.com/questions/2370526/how-to-set-an-icon-for-a-frame-in-java