Question

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MyDrawPanel extends JPanel{
    public void paintComponents(Graphics g){
        g.setColor(Color.orange);
        g.fillRect(20,50,100,100);
    }
    public static void main(String[] args){
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 500);
        frame.getContentPane().add(paintComponents(g));
        frame.setVisible(true);
    }
}

I think I should add something arguments in frame.getContentPane().add(paintComponents(g));.
I looked up Graphics class but I’m still struggling with it. What should be the parameter of it?

Answer 1

try this

public class MyDrawPanel extends JPanel{
    MyDrawPanel()
         {
         setOpaque(true);
         }


    protected void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.orange);
        g.fillRect(20,50,100,100);
    }
    public static void main(String[] args){

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.getContentPane().add(new MyDrawPanel());
        frame.setBounds(10,10,500, 500);
        frame.setVisible(true);
    }

}