How do I make a JFrame appear in the middle of the screen

When I use the setVisible method on a GUI (object which extends JFrame), it always pops up in the top left corner of the screen. What can I do to center it in the middle?

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-400)/2, (screenSize.height-300)/2, 400, 300);

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