public static void main(String[] args) {
...
}

public static void main(String args[]) {
		/* Set the Nimbus look and feel */
		//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
		/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
		 */
		try {
			for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
				if ("Nimbus".equals(info.getName())) {
					javax.swing.UIManager.setLookAndFeel(info.getClassName());
					break;
				}
			}
		} catch (ClassNotFoundException ex) {
			java.util.logging.Logger.getLogger(JFrameKeySmartTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
		} catch (InstantiationException ex) {
			java.util.logging.Logger.getLogger(JFrameKeySmartTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
		} catch (IllegalAccessException ex) {
			java.util.logging.Logger.getLogger(JFrameKeySmartTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
		} catch (javax.swing.UnsupportedLookAndFeelException ex) {
			java.util.logging.Logger.getLogger(JFrameKeySmartTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
		}
		//</editor-fold>

		/* Create and display the form */
		java.awt.EventQueue.invokeLater(new Runnable() {
			public void run() {
				new JFrameKeySmartTest().setVisible(true);
			}
		});
	}

public class Runner extends Application {
    
   // @Override
    public void start(Stage primaryStage) {
      
        JFrame... k = new JFrame...();
        k.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
}