RoundedPanel.java

package Rent_Rover; // make sure this matches your package

import javax.swing.*;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;

public class RoundedPanel extends JPanel {
    private int cornerRadius = 20; // default radius

    public RoundedPanel() {
        super();
        setOpaque(false); // important for rounded corners
    }

    public RoundedPanel(int radius) {
        super();
        cornerRadius = radius;
        setOpaque(false);
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        // Background color
        g2.setColor(getBackground());

        // Draw rounded rectangle
        g2.fill(new RoundRectangle2D.Double(0, 0, getWidth(), getHeight(), cornerRadius, cornerRadius));

        g2.dispose();
        super.paintComponent(g);
    }

    @Override
    protected void paintBorder(Graphics g) {
        Graphics2D g2 = (Graphics2D) g.create();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        g2.setColor(getForeground());
        g2.draw(new RoundRectangle2D.Double(0, 0, getWidth()-1, getHeight()-1, cornerRadius, cornerRadius));

        g2.dispose();
    }
}