Paint in Swing not working

Question

Why does this not work? It shows me the GUI but not the paint. How would I change this into two classes?

import java.awt.Graphics;
import javax.swing.JFrame;

public class runpaintgui extends JFrame{    

    public static void main(String[] args){
        JFrame frame = new JFrame();
        frame.setSize(5000,2000);
        frame.setResizable(false);
        frame.setTitle("game");
        frame.setVisible(true);    
    }

    public void paint(Graphics g){
        super.paint(g);
        g.drawString("adsf",40,45);
        g.draw3DRect(50, 30, 600, 700, true);   

        repaint();
    }    
}

What do you mean with "How would I change this into two classes?" — Jens, Jun 27 '14 at 08:18
never to call repaint(); inside paint()/paintComponent(), because can creating endless loop — mKorbel, Jun 27 '14 at 08:18
Try to extends your panel and override paintComponent() method as the [post](http://stackoverflow.com/questions/15103553/difference-between-paint-and-paintcomponent) say. — Tony, Jun 27 '14 at 08:27
*"frame.setSize(5000,2000);"* You really have a 10 mega pixel display? What is it, the Jumbotron? — Andrew Thompson, Jun 27 '14 at 08:54
"***runpaintgui***"; It's a good habit to use some name rules. You can refer to http://java.about.com/od/javasyntax/a/nameconventions.htm — Eugene, Jun 27 '14 at 09:59

score 5 · Accepted Answer · edited Jun 27 '14 at 08:55

5

You are creating a generic JFrame in this line:

JFrame frame = new JFrame();

What you want to probably do is:

JFrame frame = new runpaintgui();

Then your paint() method will be called.

edited Jun 27 '14 at 08:55

Andrew Thompson

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answered Jun 27 '14 at 08:13

Martin Dinov

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score 5 · Answer 2 · edited Jun 27 '14 at 08:31

5

You have to instantiate your class and not the JFrame class.

change:

JFrame frame = new JFrame();

to

runpaintgui frame = new runpaintgui();

Then your paint() method will be called.

And do not call repaint() in paint. Because repaint() calls paint.

edited Jun 27 '14 at 08:31

David Yee

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answered Jun 27 '14 at 08:14

Jens

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Paint in Swing not working

2 Answers2