call paintcomponent for a jpanel in jframe

Question

I have a JFrame with a JPanel on it (JPanel is private in JFrame). Now I want to override JPanel by using paintComponent method.

How can I do that?

Answer 1

When you create your instance of JPanel, (assuming you're doing it this way), do this:

JPanel panel = new JPanel(){
    @Override
    public void paintComponent(Graphics g){
       // paint code
    }
};

The other alternative is to create a private class which extends JPanel.
For example:

public class OuterClass{
    // fields, constructors, methods etc..

    private class MyPanel extends JPanel{   
       // fields, constructors, methods etc..

       @Override
       public void paintComponent(Graphics g){
          // paint code
       }

    }
}