JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BorderLayout(3, 3));
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BorderLayout(3, 3));
mainPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));