Basic Java Graphics Example

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

public class Drawing extends Canvas {
    public static void main(String[] args) {
        JFrame frame = new JFrame("My Drawing");
        Canvas canvas = new Drawing();
        canvas.setSize(500, 500);
        frame.add(canvas);
        frame.pack();
        frame.setVisible(true);
    }

    public void paint(Graphics g) {
        g.drawOval(50, 50, 100, 50);
        g.setColor(Color.GREEN);
        g.fillRect(150,200,50,50);
        g.setColor(Color.BLUE);
        g.drawString("AP Computer Science", 300,200);
    }
}