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    <p>It is an easy way to do Double Buffering.</p> <p>Let me elaborate a bit. In video games, to avoid the flicker caused by redrawing and display smoother graphics, people usually use double buffering. They create an offscreen surface, draw everything on that and then display the entire off-screen surface on the screen in one go.</p> <p><img src="https://i.stack.imgur.com/R9sHS.gif" alt="Double Buffering"></p> <p>In Java2D and Swing, the easiest way to do this, is to simply do your game sprite drawing on a JPanel, and then add the JPanel to a JFrame. </p> <p>Secondly, by drawing things on a JPanel, you allow more GUI widgets and other graphical objects to be displayed on the JFrame without having to paint them manually in the game loop. For example buttons, menus, other panels, even other rendering JPanels.</p> <p>Thirdly, it allows you to use automatically translated co-ordinates for your game. You can draw everything from the top-left to the bottom-right without having to worry about the window manager specific things like window border-widths, task panes, titles etc.!</p> <p><img src="https://i.stack.imgur.com/YnV6q.png" alt="translated co-ordinates"></p> <p>Moreover, this is not just a convention only used by Game Programmers in Java. Creating a separate <em>Game Board</em>, <em>Render Panel</em> or <em>Graphics Widget</em> is quite popular when programming games using a library with an internal mainloop such as a GUI Toolkit. You can use a User Form in Windows Forms and a Drawing Board in GTK+.</p>
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    1. POWhy is attaching a JPanel better?
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    1. CODrawing an image on a JPanel and then adding the JPanel to the JFrame is not how to do double-buffering. I'm pretty sure you can double-buffer in a JFrame.
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    2. CO@Richante I know very well you can double buffer in a JFrame, what I said was using a JPanel is the _easiest_ way, not the _only_ way to do double-buffering with Java2D and Swing.
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    3. CO@Richante also, why isn't it a way to do double-buffering? It's used pretty often for that very purpose.
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