JPanel panel = new JPanel(); panel.setBorder(BorderFactory.createLineBorder(Color.black));
JPanel panel = new JPanel(); panel.setBorder(BorderFactory.createTitledBorder("Title"));
class CustomBorder implements Border { // Define custom border methods here } JPanel panel = new JPanel(); panel.setBorder(new CustomBorder());This will create a new instance of the CustomBorder class and use it to set a custom border on the JPanel. Overall, the JPanel setBorder method is a useful way to add visual styling to JPanels in Java applications.