Painting in JPanel with PaintComponent.

Question

Hi I've got a problem, if i define my JPanel like this then I can't paint in it.
public class kvadrat
JPanel aPanel;
public void Panel()
  aPanel = new JPanel();
  aPanel.setBackground(Color.white);
  aPanel.add(sendButton);
public void Frame()
  Panel();
  JFrame frame = new JFrame("Considerate Music");
  Container iRutan = frame.getContentPane();
  iRutan.setLayout(new BorderLayout());
  iRutan.add(aPanel);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setBounds(300,300,700,400);
  frame.setVisible(true);
public kvadrat()
  Frame();
public static void main(String[] args)
  new kvadrat();
public void paintComponent(Graphics g)
}I can't use the line super.paintComponent(g); in paintComponent because I don't have any extend. I don't want to have any extends on my class so this is why I'm asking, is there a way to paint on my panel(aPanel) in any other way that using extends. You see if I'd like to add more panels I'll have to create a class for each panel and I don't like that.

Answer 1

2 Ways.
#1: An Inner Class
public class kvadrat{
public kvadrat(){
new MyPanel();
//inner class
public class MyPanel extends JPanel{
// methods
}or
#2: Anonymous Inner Classes (very sloppy)
public class kvadrat
JPanel aPanel;
public void Panel()
// right here:
  aPanel = new JPanel(){
       public void paintComponent(Graphics g){
  // code goes here
  aPanel.setBackground(Color.white);
  aPanel.add(sendButton);
public void Frame()
  Panel();
  JFrame frame = new JFrame("Considerate Music");
  Container iRutan = frame.getContentPane();
  iRutan.setLayout(new BorderLayout());
  iRutan.add(aPanel);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setBounds(300,300,700,400);
  frame.setVisible(true);
public kvadrat()
  Frame();
public static void main(String[] args)
  new kvadrat();
// removed: public void paintComponent(Graphics g)
}