CCNA, CCNP, MCSA, CCNA Final Exam, All Answer Test Module With 100/100

I write a Java code, but I have a trouble with GUI problem. When I add a component into JFrame object, then I call repaint() method in order to update the GUI but it doesn't work. But when I minimize or resize this frame, the GUI is updated. Here is my code: public static void main(String[] args) { JFrame frame = new JFrame(); frame.setSize(460, 500); frame.setTitle("Circles generator"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); String input = JOptionPane.showInputDialog("Enter n:"); int n = Integer.parseInt(input); CircleComponent component = new CircleComponent(n); frame.add(component); component.repaint(); }