Spaghetti solution

package test;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class Math_Problems {
    public static void main(String[] args) {

        JFrame frame = new JFrame("Square");
        frame.setSize(620, 620);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        frame.getContentPane().setBackground(Color.RED);




        JButton red = new JButton("Red");
        red.setBounds(0,0, 200, 200);
        red.setForeground(Color.BLACK);
        red.setBackground(Color.RED);
        red.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {
            panel.setBackground(Color.RED);
            }
            });

        JButton green = new JButton("Green");
        green.setBounds(210, 0, 200, 200);
        green.setBackground(Color.GREEN);
        green.setForeground(Color.BLACK);
        green.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {
            panel.setBackground(Color.GREEN);
            }
            });

        JButton blue = new JButton("Blue");
        blue.setBounds(420, 0, 200, 200);
        blue.setBackground(Color.BLUE);
        blue.setForeground(Color.WHITE);
        blue.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent arg0) {
            panel.setBackground(Color.BLUE);
            }
            });

        JButton yellow =new JButton("Yellow");
        yellow.setBounds(0, 210, 200, 200);
        yellow.setBackground(Color.YELLOW);
        yellow.setForeground(Color.BLACK);

        JButton cyan = new JButton("Cyan");
        cyan.setBounds(210, 210, 200, 200);
        cyan.setBackground(Color.CYAN);
        cyan.setForeground(Color.BLACK);

        JButton magenta = new JButton("Magenta");
        magenta.setBounds(420, 210, 200, 200);
        magenta.setBackground(Color.MAGENTA);
        magenta.setForeground(Color.WHITE);


        JButton white = new JButton("white");
        white.setBackground(Color.WHITE);
        white.setBounds(0, 420, 200, 200);
        white.setForeground(Color.BLACK);

        JButton black = new JButton("black");
        black.setBounds(210, 420, 200, 200);
        black.setBackground(Color.BLACK);
        black.setForeground(Color.WHITE);

        JButton gray = new JButton("Gray");
        gray.setBounds(420, 420, 200, 200);
        gray.setBackground(Color.GRAY);
        gray.setForeground(Color.WHITE);

        panel.add(red);

        frame.add(red);
        frame.add(green);
        frame.add(blue);
        frame.add(yellow);
        frame.add(cyan);
        frame.add(magenta);
        frame.add(white);
        frame.add(black);
        frame.add(gray);


        frame.add(panel);






        frame.setVisible(true);



        }

}