Java AWT Color predefined color constant value

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

class DrawPanel extends JPanel {
   public void paintComponent(Graphics g) {

      g.setColor(Color.red);// w  ww  .j a  v a 2  s.c  o m
      g.drawOval(10, 10, 50, 50);
      g.fillOval(70, 90, 140, 100);

      g.setColor(Color.blue);
      g.drawOval(190, 10, 90, 30);
      g.drawRect(10, 10, 60, 50);

      g.setColor(Color.cyan);
      g.fillRect(100, 10, 60, 50);
      g.drawRoundRect(190, 10, 60, 50, 15, 15);

   }
}

public class Main {
   public static void main(String[] args) {
      DrawPanel panel = new DrawPanel();

      JFrame application = new JFrame();

      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      application.add(panel);
      application.setSize(250, 250);
      application.setVisible(true);
   }
}