Adding graphics to JPanel java

Question

Making a small little game for my computer science class but im struggling to figure out how to add graphics to a JPanel here's what I have so far

import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.*;


public class Map extends JComponent{
private JFrame frame;
private JPanel panel;

Map()
{
    setPreferredSize(new Dimension(500,500));
}

 @Override 
 public void paintComponent(Graphics g) {
 super.paintComponent(g);          
 g.drawRect(100,150, 100, 100);
   }

public void makeMap()
{
    frame = new JFrame();
    panel = new JPanel();
    frame.getContentPane().add(panel);
    frame.pack();
    frame.setVisible(true);
    frame.setTitle("MAP");
}
}

Answer 1

You're not adding the Map component to the JPanel that you've created. Basically you lack the following lines in makeMap():

panel.setLayout(new BorderLayout());
panel.add(this);

Instead of setting the BorderLayout of the panel after its construction, you could also set it during construction, then it would look like this:

panel = new JPanel(new BorderLayout());
panel.add(this);