RoundedPanel.java

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

public class RoundedPanel extends JPanel {
    private Color backgroundColor;
    private int cornerRadius = 15;  // Set the corner radius for rounded effect

    public RoundedPanel(LayoutManager layout, int radius) {
        super(layout);
        this.cornerRadius = radius;
    }

    public RoundedPanel(LayoutManager layout, int radius, Color bgColor) {
        super(layout);
        this.cornerRadius = radius;
        this.backgroundColor = bgColor;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Dimension arcs = new Dimension(cornerRadius, cornerRadius);
        int width = getWidth();
        int height = getHeight();
        Graphics2D graphics = (Graphics2D) g;
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        // Draw a rounded rectangle with shadow effect
        graphics.setColor(backgroundColor != null ? backgroundColor : getBackground());
        graphics.fillRoundRect(0, 0, width - 1, height - 1, arcs.width, arcs.height);  // Rounded panel
    }
}