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

public class JavaSwing {

    public static void main(String[] args) {
        JFrame frmMain = new JFrame();
        frmMain.setSize(600, 600);
        frmMain.setVisible(true);

        JPanel panel = new JPanel(){
            @Override
            public void paintComponent(Graphics g) {
                super.paintComponent(g);
                //Draw first quadrant
                g.setColor(Color.BLUE);
                g.fillArc(200, 200, 80, 80, 0, 90);

                //Draw second quadrant
                g.setColor(Color.YELLOW);
                g.fillArc(200, 200, 80, 80, -180, -90);

                //Draw third quadrant
                g.setColor(Color.GREEN);
                g.fillArc(200, 200, 80, 80, -180, 90);

                //Draw fourth quadrant
                g.setColor(Color.RED);
                g.fillArc(200, 200, 80, 80, 0, -90);
            }
        };

        frmMain.add(panel);
        frmMain.repaint();
    }

}