Using a Jpanel to draw random rectangles

Just need some assistance with drawing random rectangles inside of a JPanel when the form loads. I have a seperate rectangle class created that has a constructor for the following :

Code:

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  public Rectangle(int newX, int newY, int newWidth, int newHeight, Color newColor)
    {
        x = newX;
        y = newY;
        width = newWidth;
        height = newHeight;
        color = newColor;
    }

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It also has a paint method. I also have another JFrame class for my GUI created but I am new to GUIs and not sure how to do this. My panel is named panelRectangles and when the form loads it is supposed to create a whole bunch of random rectangles in the panel to be used for sorting. I am supposed to use the following code to make a seperate class that extends JPanel and will be used to draw my rectangles but not sure where it goes.. in my GUI Frame Class? Thanks for any assistance.

Code:

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staticclass RectanglePanel extends JPanel
{
  public RectanglePanel()
  {
    super();
    setOpaque(false); // don't paint all the bits
    setBorder(BorderFactory.createLineBorder(Color.black));
  }
  protectedvoid paintComponent(Graphics g)
  {
// code to paint the rectangles goes here
  }
}

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And your question is??????

Sorry here is updated code. I have in my package the MyRectangle class, a blank JForm class called RectGUI and the class for the panel RectGUIPanel. The following code is from my panel and it should create random rectangles okay but how do I display them inside of a Panel on my RectGUI form? Thanks alot for the assistance.

Code:

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//Declare variables
    private int x;
    private int y;
    private int width;
    private int height;
    private Color color;
    Random rand = new Random();
 
 
    public class RectanglePanel extends JPanel
{   
       
        public void displayRectangles()
        {           
            // Declare an arraylist of MyRectangles
            ArrayList<MyRectangle> myArray = new ArrayList<MyRectangle>();
            int maxNumber = 300;
           
          // Declare Frame and Panel
            JFrame frame = new JFrame();
            Container pane = frame.getContentPane();
            RectanglePanel rect = new RectanglePanel();
     
            // Set Frame attributes
            frame.setSize(700, 500);
            frame.setLocation(100,100);
            frame.setAlwaysOnTop(true);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setTitle(" Rectangle Program");
            frame.setVisible(true);
     
            for (int i = 0; i < maxNumber; i++)
            {
                MyRectangle rec = createRandomRec();
                myArray.add(rec);
                rect.repaint();
            }
 
        }
 
        public MyRectangle createRandomRec() 
        {
              x = rand.nextInt();
              y = rand.nextInt();
              width = rand.nextInt();
              height = rand.nextInt();
              color = new Color(rand.nextInt(256), rand.nextInt(256), rand.nextInt(256));
              return new MyRectangle(x, y , width, height, color);
       
         
        }
    }
   
    }

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