How to set Icon to JFrame

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Better use a .png file; .ico is Windows specific. And better to not use a file, but a class resource (can be packed in the jar of the application).

URL iconURL = getClass().getResource("/some/package/favicon.png");
// iconURL is null when not found
ImageIcon icon = new ImageIcon(iconURL);
frame.setIconImage(icon.getImage());

Though you might even think of using setIconImages for the icon in several sizes.

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