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Thread: How do I access frame class?

  1. #1
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    Default How do I access frame class?

    Program.java
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.lang.*;
    import javax.swing.*;
     
    public class Program{
     
        public static void main(String[] args) {
     
    		Main main = new Main();
    		JFrame frame = new JFrame("Title");
    		frame.add(main);
    		frame.setVisible(true);
    	        frame.pack();
    		main.setup();
    		main.update();
     
        }
     
    }

    Main.java
    import java.awt.Graphics;
    import java.util.concurrent.*;
    import java.lang.*;
    import javax.swing.*;
    import java.awt.Dimension;
     
    public class Main extends JPanel{
     
    	public void setup(){
     
    	}
     
    	public void update(){
     
    		while(true){
     
    			try{
    			TimeUnit.MILLISECONDS.sleep(16);
    			frame.repaint();
    			}catch(Exception E){}
    		}
     
    	}
     
    	public void draw(Graphics g){
     
     
    	}
     
    	public Dimension getPreferredSize() {
     
            return new Dimension(500, 500);
     
        }
     
    	//override stuff
    	public void paintComponent(Graphics g) {
     
            super.paintComponent(g);
    		draw(g);
     
        }
     
    }

    the problem is that I cannot access frame.repaint() in Main.java, how do I fix it? I prefer simple, beginner friendly looking code, not making AAA game.

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: How do I access frame class?

    The update class could get access to the frame variable by passing frame in the call to update:
      main.update(frame);  // pass ref to frame to method
    The update method will need to be rewritten to accept frame.
    If you don't understand my answer, don't ignore it, ask a question.

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