Как посмотреть цвет фигуры?

Имеется программа на Java(простой граф. редактор, который добавляет синие квадраты на экран нажатием ЛКМ). Нужно, чтобы при двойном клике на синий квадрат этот же синий квадрат становился красным. Вопрос: как это реализовать?

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import javax.swing.*;

class MouseComponent extends JComponent
{
    private static final int DEFAULT_WIDTH = 1200;
    private static final int DEFAULT_HEIGHT = 600;

    private static final int SIDELENGTH = 10;
    private ArrayList<Rectangle2D> squares;
    private Rectangle2D current; // the square containing the mouse cursor

    public MouseComponent()
    {
        squares = new ArrayList<>();
        current = null;

        addMouseListener(new MouseComponent.MouseHandler());
        addMouseMotionListener(new MouseComponent.MouseMotionHandler());
    }

    public Dimension getPreferredSize() { return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); }

    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.blue);
        // draw all squares
        for (Rectangle2D r : squares)
            g2.draw(r);
    }

    /**
     * Finds the first square containing a point.
     * @param p a point
     * @return the first square that contains p
     */
    public Rectangle2D find(Point2D p)
    {
        for (Rectangle2D r : squares)
        {
            if (r.contains(p)) return r;
        }
        return null;
    }

    /**
     * Adds a square to the collection.
     * @param p the center of the square
     */
    public void add(Point2D p)
    {
        double x = p.getX();
        double y = p.getY();

        current = new Rectangle2D.Double(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH, SIDELENGTH);
        squares.add(current);
        repaint();
    }

    /**
     * Removes a square from the collection.
     * @param s the square to remove
     */
    public void remove(Rectangle2D s)
    {
        if (s == null) return;
        if (s == current) current = null;
        squares.remove(s);
        repaint();
    }

    private class MouseHandler extends MouseAdapter
    {
        public void mousePressed(MouseEvent event)
        {
            // add a new square if the cursor isn't inside a square
            current = find(event.getPoint());
            if (current == null) add(event.getPoint());
        }

        public void mouseClicked(MouseEvent event)
        {
            // remove the current square if double clicked
            current = find(event.getPoint());
            /*if (current != null && event.getClickCount() == 2) {

            }*/
            if(current != null && event.getClickCount() == 2 ){
                remove(current);
            }

        }
    }

    private class MouseMotionHandler implements MouseMotionListener
    {
        public void mouseMoved(MouseEvent event)
        {
            // set the mouse cursor to cross hairs if it is inside
            // a rectangle

            if (find(event.getPoint()) == null) setCursor(Cursor.getDefaultCursor());
            else setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
        }

        public void mouseDragged(MouseEvent event)
        {
            if (current != null)
            {
                int x = event.getX();
                int y = event.getY();

                // drag the current rectangle to center it at (x, y)
                current.setFrame(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH, SIDELENGTH);
                repaint();
            }
        }
    }
}

class MouseFrame extends JFrame
{
    public MouseFrame()
    {
        add(new MouseComponent());
        pack();
    }
}

public class Main {

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new MouseFrame();
            frame.setTitle("MouseTest");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
        });
    }
}