docs: public static void setStyle() {
  
          int style = Font.PLAIN;
  
          if (ckbbold.isSelected()) {
              style |= Font.BOLD;
          }
  
          if (ckbitalic.isSelected()) {
              style |= Font.ITALIC;
          }
  
          fOwner.tTree.setFont(fOwner.txtCommand.getFont().deriveFont(style));
          fOwner.txtCommand.setFont(
              fOwner.txtCommand.getFont().deriveFont(style));
          fOwner.txtResult.setFont(
              fOwner.txtResult.getFont().deriveFont(style));
      }