Can't getGraphics from JPanel

Question

Hi,
I want to get the graphics context from a JPanel so I can draw on it. In the example below, theStage ends up null, causing a null pointer exception - where am I going wrong??
class win extends JFrame{
      Container c;
      win(){
            stage stage = new stage();
            c = getContentPane();
            c.add(stage);
            setSize(400,400);
            setResizable(false);
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setVisible(true);
      class stage extends JPanel {
                  stage(){
                     Graphics2D theStage = (Graphics2D)getGraphics();
                     theStage.drawLine(0,0,100,100);
}big thanks for any help,
Des

Answer 1

Swing questions should go in the Swing forum.
And the "drawLine" call should go in the paintComponent method. You need to override the JPanel's paintComponent method to do your drawing.
The Graphics is null because the JPanel isn't visible yet.