Java Swing Component JLabel with option 'requiredShow' https://prnt.sc/cD4v5CngTiWf

ELabel.java

import com.formdev.flatlaf.ui.FlatTextBorder;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

/**
 *
 * @author Rodrigo Cananea <rodrigoaguiar35@gmail.com>
 */
public class ELabel extends JLabel {

    public ELabel() {
        super();
        super.setBorder(BorderFactory.createCompoundBorder(new FlatTextBorder(), BorderFactory.createEmptyBorder(0, 8, 0, 8)));
    }

    public boolean isBorderLineShow() {
        return borderLineShow;
    }

    public void setBorderLineShow(boolean borderLineShow) {
        this.borderLineShow = borderLineShow;
    }

    public boolean isRequiredShow() {
        return requiredShow;
    }

    public void setRequiredShow(boolean requiredShow) {
        this.requiredShow = requiredShow;
    }

    private boolean borderLineShow;
    private boolean requiredShow;

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

            Color line = Color.BLACK;

            g2.setColor(line);

            int height = getHeight();
            g2.drawRoundRect(0, 0, getWidth() - 1, height - 1, height - 3, height - 3);
        }
        super.paintBorder(grphcs);
    }

    @Override
    public void paintComponent(Graphics grphcs) {
        super.paintComponent(grphcs);

        if (requiredShow) {
            createRequiredMark(grphcs);
        }
    }

    private void createRequiredMark(Graphics grphcs) {
        String requiredText = "*";
        int requiredMargin = 4;

        Insets insets = new Insets(0, requiredMargin, 0, requiredMargin);

        Border border = getBorder();
        if (border instanceof EmptyBorder) {
            EmptyBorder emptyBorder = (EmptyBorder) border;

            Insets insetsBorder = emptyBorder.getBorderInsets();

            insets.left += insetsBorder.left;
            insets.right += insetsBorder.right;
        }

        Graphics2D g2d = (Graphics2D) grphcs;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);

        g2d.setColor(Color.red);

        Font font = getFont();
        g2d.setFont(new Font(font.getFamily(), Font.PLAIN, font.getSize()));

        FontMetrics fm = g2d.getFontMetrics();

        int x, y = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent();

        int align = getHorizontalAlignment();

        String text = getText();

        switch (align) {
            case LEADING:
            case LEFT:
                x = fm.stringWidth(text) + insets.left;
                break;
            case RIGHT:
                x = (getWidth() - fm.stringWidth(text)) - insets.left - 2;
                break;
            default: // Centralizar
                x = ((getWidth() - fm.stringWidth(text)) / 2) + fm.stringWidth(text) + insets.right;
                break;
        }

        g2d.drawString(requiredText, x, y);
    }

}