If you'd rather not make your class Runnable, as shown in the first example, you can just create a Runnable instance on the fly, as shown in the main method of this second JFrame example: Of course there are always different ways of doing things. SwingUtilities.invokeLater(new JFrameExample()) īut that can be a little hard for a new Java developer to deal with, so I left it as shown above. To make the code smaller I could reduce the main method to look like this:

Note that the proper way to display a JFrame is by using the SwingUtilities invokeLater method to make sure this 'job' is placed on the Event Dispatch Thread (EDT). Those are pretty much the minimal lines of code you need to construct and display a JFrame that (a) has the size you intended and (b) the user can close by selecting a quit/exit operation. JFrame frame = new JFrame('My JFrame Example') įtDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE) įtPreferredSize(new Dimension(400, 200)) schedule this for the event dispatch thread (edt) JFrameExample example = new JFrameExample() Public class JFrameExample implements Runnable This example shows how to construct a JFrame, and make sure it's properly displayed using the SwingUtilities invokeLater method: To that end, here is the source code for a simple 'JFrame example' demo class. Here are two examples that show the correct technique. This morning when I saw some Java JFrame code on a mailing list, it made me think that I needed to put a simple JFrame example out here, something that would show how to properly construct and display a JFrame without getting into a discussion of anything else.

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