Example of drawing something on Swing JComponent

Draw something on Swing JComponent

package javaswingdrawing;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaSwingDrawing extends JComponent {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            createAndShowGUI();
        });
    }

    @Override
    public void paint(Graphics g) {
        
        Graphics2D graphics2d = (Graphics2D)g;
        
        int w = getWidth();
        int h = getHeight();
        graphics2d.setColor(Color.red);
        graphics2d.fillOval(w/4, h/4, w/2, h/2);
        graphics2d.setColor(Color.blue);
        graphics2d.fillRect(w/2, h/2, w/4, h/4);
    }

    private static void createAndShowGUI() {
        JFrame myFrame = new JFrame();
        myFrame.setTitle("java-buddy.blogspot.com");
        myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        myFrame.setSize(new Dimension(400, 300));
        myFrame.setLayout(new BorderLayout());
        myFrame.add(new JavaSwingDrawing(), BorderLayout.CENTER);
        myFrame.setVisible(true);
    }
}

Next:
- Implement MouseAdapter for JComponent
- Detect mousePressed and mouseDragged with MouseAdapter

More:
- Display JTable data in line chart using JComponent