I need help to draw in a frame, please

Question

Hi Im new to java and I need some help to draw a rainbow in a frame. I already made the frame , but i dont know how to draw inside the frame.
here is my code so far:
import java.awt.*;
import javax.swing.*;
public class Regnbue {
     public static void main(String[]args){
          JFrame ramme = new JFrame();
          ramme.setSize(600,300);
          Container cp = ramme.getContentPane();
          cp.setBackground(Color.white);
          ramme.setVisible(true);
any help to finish this simple draw would be nice!!
thanx

Answer 1

I forgot , here is my code so far :
import java.awt.*;
import javax.swing.*;
public class Regnbue {
     public static void main(String[]args){
          Rainbowpanel r= new Rainbowpanel();// her is where i make
// my frame I think.
          JFrame ramme = new JFrame();
          ramme.setSize(600,300);
          Container cp = ramme.getContentPane();
          cp.setBackground(Color.white);
          ramme.setVisible(true);
class Rainbowpanel extends JPanel {
     public void paintComponent(Graphics g) {// this is the part that I
// dont understand, how can I put the arc into the container above??
          super.paintComponent(g);
          g.fillArc(5, 5, 10, 50, 0, 180);
     thanks
elektropan