Boilerplate code to start a swing GUI

BoilerPlate.java

public BoilerPlate(){
        JFrame frame = new JFrame();
        JPanel panel = new JPanel();
        frame.add(panel, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("title");
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | UnsupportedLookAndFeelException | IllegalAccessException | InstantiationException e) {
            e.printStackTrace();
        }
        frame.pack();
        frame.setVisible(true);
}