import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.util.Random;
import java.awt.event.ActionListener;

public class main {
    public static void main(String[] args) {
        JPanel mainPanel = new JPanel(new BorderLayout(1,1));
        JFrame frame = new JFrame("Test Four");
        BullsEye eye = new BullsEye();
        eye.setPreferredSize(new Dimension(200,400));
        JPanel panel = new JPanel(new GridLayout(1,4));
        String buttonTexts[] = {"Red","Green","Blue","Random"};
        for(int i = 0; i < buttonTexts.length; i++) {
            JButton button = new JButton(buttonTexts[i]);
            button.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent actionEvent) {
                   switch (actionEvent.getActionCommand()) {
                       case "Red":
                           BullsEye.cc = Color.RED;
                           frame.repaint();
                           break;
                       case "Green":
                           BullsEye.cc = Color.GREEN;
                           frame.repaint();
                           break;
                       case "Blue":
                           BullsEye.cc = Color.BLUE;
                           frame.repaint();
                           break;
                       case "Random":
                           Random rand = new Random();
                           int r = rand.nextInt(255);
                           int g = rand.nextInt(255);
                           int b = rand.nextInt(255);
                           BullsEye.cc = new Color(r,g,b);
                           frame.repaint();
                           break;

                   }
                }
            });
            panel.add(button);
        }

        mainPanel.add(panel, BorderLayout.SOUTH);
        mainPanel.add(eye, BorderLayout.NORTH);
        frame.add(mainPanel);
        frame.pack();
        frame.setSize(500, 600);
        frame.setVisible(true);
    }
    public static class BullsEye extends  JComponent {
        private static Color cc = Color.RED;
        private static final int WIDTH_RADIUS = 25;
        private static final int X_AND_Y = 200;
        public void paintComponent(Graphics g) {
            int x = X_AND_Y + 30;
            int y = X_AND_Y;
            int numCircle = 5;

            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(cc);

            for (int i = numCircle; i > 0; i--) {
                if (i % 2 == 0) {
                    g2.setColor(new Color(255,255,255,255));
                } else {
                    g2.setColor(cc);
                }
                int diameter = i * 100 / numCircle;
                g2.fillOval(x - diameter, y - diameter, diameter * 2, diameter * 2);
            }
        }
    }
}