How to set an icon for a frame in Java?

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

fra开发者_如何学JAVAme.setIconImage(Toolkit.getDefaultToolkit().getImage("tictactoe.gif"));

Unfortunately the frame icon still shows default java icon instead.

How to fix this?

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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.

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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?