How to customize the size of frame Icon image?

I am creating Swing frame demo.

I have set an 开发者_JS百科image icon in the title bar of JFrame, and I know the default size of the icon is 16x16. How can I change the height and width of the icon?

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The frame icon image size can't be changed. If you need something really custom you will to create your own decorations for a window, but that is not as simple as just changing the size of an icon.