How to display rectangles with the following code in a JPanel?

Question

I am trying to make a bunch of random rectangles appear inside a JPanel on a GUI form. Im not sire how to display the form and panel with random rectangles. 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 for the assistance.
//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);
    }

Answer 1

I am trying to make a bunch of random rectangles appear inside a JPanel on a GUI form. Im not sire how to display the form and panel with random rectangles. 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 for the assistance.
//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);
    }