need help using the paintComponent method

[Todd Swift]

Hi, I'm reading the Head First Java book and am having problems using the example regarding the paintComponent method (pg. 364 chapter 12). I've made a subclass of JPanel but cannot seem to call the paintComponent method. I've pasted my code below; any tips would be appreciated!

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package mydrawpaneltest;

import java.awt.*;
import javax.swing.*;

public class MyJPanel extends JPanel {

/** Creates a new instance of MyJPanel */
public MyJPanel() {
}

public void paintComponent(Graphics g) {

g.setColor(Color.orange);
g.fillRect(20, 50, 100, 100);

}
}


----------------------------------------------------------

package mydrawpaneltest;

public class Main {

public Main() {
}

public static void main(String[] args) {

MyJPanel myJPan = new MyJPanel();
myJPan.repaint();
}
}

[Justin Fox]

in the paintComponent(Graphics g)

add.

super.paintComponent(g);


Justin

[Michael Dunn]

if that is all of your code, the panel needs to be in a frame/contentPane
and for the frmae to be visible.

try this for your Main()

    
public class Main {
  public static void main(String[] args) {
    MyJPanel myJPan = new MyJPanel();
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setSize(200,200);
    f.setLocationRelativeTo(null);
    f.setContentPane(myJPan);
    f.setVisible(true);
    //myJPan.repaint();
  }
}

[Todd Swift]

Thanks for your help; putting the panel in the frame worked! Thanks to all for your help.