Why Java isn't letting me change the background color of the current Panel?

Basically, I just try to learn all that there is on interactive mouse movements and seeks to build a kind of frankenstein-ish drawing program.

Here is the code:
import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;


public class MyPaint extends JPanel
{
    JButton button;
    JFrame frame;
    int currentX;
    int currentY;
    int counter = 1;
    
    public MyPaint()
    {
        createComponents();
        addComponentsToPanels();
        setFrameProperties();
        activateListeners();
    }

    public void addComponentsToPanels()
    {
        this.add(button);
    }

    public void createComponents()
    {
        button = new JButton("Button");
        button.setToolTipText("This is the first button");
    }

    public void setFrameProperties()
    {
        frame = new JFrame();
        frame.setSize(400,400);
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(this);
    }

    public void activateListeners()
    {
        MyMouseListener listener = new MyMouseListener();
        button.addMouseListener(listener);
        button.addMouseMotionListener(listener);
    }

    private class MyMouseListener implements MouseListener, MouseMotionListener
    {
        MyPaint myPaint = new MyPaint();

        public void mouseClicked(MouseEvent e) throws UnsupportedOperationException
        {
            JOptionPane.showMessageDialog(null,"The mouse was clicked!");
        }

        public void mousePressed(MouseEvent e) throws UnsupportedOperationException
        {
            JOptionPane.showMessageDialog(null,"The mouse was pressed!");
        }

        public void mouseReleased(MouseEvent e) throws UnsupportedOperationException
        {
            JOptionPane.showMessageDialog(null,"The mouse was released!");
        }

        public void mouseEntered(MouseEvent e) throws UnsupportedOperationException
        {
            myPaint.setBackground(Color.RED); // why isn't this working? - I want the original panel to be red (not the newly created windows on top)
        }

        public void mouseExited(MouseEvent e) throws UnsupportedOperationException
        {
            myPaint.setBackground(Color.BLUE); // why isn't this working? - I want the original panel to be blue (not the newly created windows on top)
        }

        public void mouseDragged(MouseEvent e) throws UnsupportedOperationException
        {
            currentX = e.getX();
            currentY = e.getY();
            repaint();
        }

        public void mouseMoved(MouseEvent e) throws UnsupportedOperationException // why is this only being called once?
        {
            System.out.println("mouseMoved: " + counter);
            counter++;
        }
    }

    public static void main(String[] args)
    {
        new MyPaint();
    }
}
I just want to know how to make the inner class to set the background of the Panel of the outer class to the same window, instead of doing what I want, but in a newly opened window.

Any help to resolve this would be greatly appreciated!
Thanks in advance!

MyPaint myPaint = new MyPaint();

Get rid of this line, it is originally an unlimited number of images to create.

Then replace the following lines:

//            myPaint.setBackground(Color.RED);
            setBackground(Color.RED); 

...
//            myPaint.setBackground(Color.BLUE);
            setBackground(Color.BLUE);

Tags: Java

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