Get Jbutton Background Image Background

Get Jbutton Background Image Background. } i don't know why the button's background is still white. It look like the following image.

Projavatricks How To Change Background Color Using Jcolor Chooser In Java
Projavatricks How To Change Background Color Using Jcolor Chooser In Java from 1.bp.blogspot.com

} i don't know why the button's background is still white. In javax.swing.plaf.metal.metallookandfeel they look like what i want however under weblookandfeel they look like this: Like & subscribe for useful stuffs.

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Each buttons not only have text (1, 2, 3, enter.etc) but also have background color is kind of gradient so my ideal is use the background image. But when i tried to set. Chrome, edge, firefox, opera, safari. The background property can then be set.