Question

How can I create a JFrame that would look like a JPanel/JLabel?

I need a splash screen that will be displayed while my program does some computing before showing the main window (I know there’s a splash screen option in Java, but I need mine to show after loading class, not during).

How can I create that?

Answer 1

Create an undecorated JFrame like this:

JFrame frame = new JFrame();
frame.setUndecorated(true);

However, I suggest you use the java.awt.SplashScreen as it is a piece of code that has been used and tested in so many cases, so it is definitely more stable than the one you can write.