MagicSquare.java

package lesson5_8.Homework;


import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Random;

public class MagicSquare extends JPanel implements MouseListener {

    private int randomPosition;
    public MagicSquare() {

        JFrame frame = new JFrame("MyMagicSquare");
        frame.setMinimumSize(new Dimension(500, 500));
        frame.setLocation(300, 100);
        frame.getContentPane().add(this);
        frame.addMouseListener(this);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {

        new MagicSquare();
    }

    @Override
    public void paintComponent(Graphics g) {

        super.paintComponent(g);
        g.setColor(getRandomColor());
        g.fillRect(0, 0, 500, 500);
    }

    public Color getRandomColor() {

        Color[] randomColors = {Color.GRAY, Color.BLUE, Color.RED, Color.YELLOW};
        randomPosition = -1;
        Color randColor = randomColors[getRandomNum()];
        return randColor;
    }

    public int getRandomNum() {

        Random random = new Random();
        int randomInt = random.nextInt(4);
        if (randomPosition == randomInt) {
            return getRandomNum();
        }
        randomPosition = randomInt;
        return randomInt;
    }

    @Override
    public void mouseClicked(MouseEvent e) {

        repaint();
    }

    @Override
    public void mousePressed(MouseEvent e) {

    }

    @Override
    public void mouseReleased(MouseEvent e) {

    }

    @Override
    public void mouseEntered(MouseEvent e) {

    }

    @Override
    public void mouseExited(MouseEvent e) {

    }
}