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

public class MyPanel extends JPanel {
	@Override
	protected void paintComponent(Graphics g) {
		// clean the panel
		super.paintComponent(g);
		// draw
		g.setColor(Color.RED);

		g.drawRect(30, 30, 60, 60);
		g.drawRect(15, 40, 60, 60);
		g.drawLine(30, 30, 15, 40);
		g.drawLine(90, 30, 75, 40);
		g.drawLine(90, 90, 75, 100);
		g.drawLine(30, 90, 15, 100);
		// use g to draw a Cylinder
		g.setColor(Color.BLUE);
		g.drawOval(120, 20, 60, 20);
		g.drawLine(120, 30, 120, 90);
		g.drawLine(180, 30, 180, 90);
		g.drawOval(120, 80, 60, 20);

	}
}