I can't call the repaint() method in my main method

Question

Everytime I try to call the repaint() method it says a non static method cannot be reference from a static method. Btw, it\'s in the same class as the paintComponent method. I t

Answer 1

You can't call it from main() because you can't call non-static functions (repaint()) or use non-static variables inside a static method (main()).

Instead make the main class implement Runnable and use a thread:

Thread repaintThread = new Thread("some_name", this); // \
public void run(){                                    // |
   while(true){                                       // >-Theese shall be in the main class
       repaint();                                     // |
   }                                                  // |
}                                                     // /
repaintThread.start();    //this shall be in main()

Answer 2

The main method is static. Your p object is not: it is an instance field of the P class. Try this:

public static void main(String[] args) throw InterruptedException {
    EventQueue.invokeLater( new Runnable() {
        public void run() {
            P p = new P();
            p.repaint();
        }
    } );
}

You should always access Swing components from the event dispatch thread, which is why I put it all in a EventQueue invokeLater.