Canvas problem

Question

Hi,
I don't know why the red rectangle don't display until I resize the window.
import java.awt.*;
import javax.swing.*;
public class myFrame extends JFrame {
     public myFrame() {
          setSize(400, 400);
          setVisible(true);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          add(new myCanvas());
     public static void main(String[] args) {
          new myFrame();
class myCanvas extends Canvas {
     public void paint(Graphics g) {
          g.setColor(Color.RED);
          g.fillRect(10, 10, 100, 100);
}Thanks in Advance!
Fai

Answer 1

setSize(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(new myCanvas());
// This should be called last.
setVisible(true);