Java Grafika Tvary

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

/**
 *
 * @author IT Academy
 */
public class Main extends JPanel {

    public static void main(String args[]) {
        JFrame f = new JFrame("Kreslime v Jave");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Main d = new Main();
        f.add(d);
        f.setSize(500, 280);
        f.setVisible(true);
    }




    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        this.setBackground(Color.WHITE);

        g.setColor(new Color(125,125,125));
        g.drawLine(10, 10, 100, 30);

        g.setColor(Color.BLUE);
        g.drawRect(10, 50, 100, 30);

        g.setColor(Color.ORANGE);
        g.fill3DRect(10, 90, 100, 30, false);

        g.setColor(Color.cyan);
        g.drawOval(10, 130, 100, 30);
    }


}