import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;

public class JavaFXAppController implements Initializable
{
    @FXML
    private Label lblNumber;

    @FXML
    private Button btnClick;

    @FXML
    private TextField txtNumber;

    @FXML
    private void handleButtonAction(ActionEvent event)
    {
        int val = Integer.parseInt(txtNumber.getText());
        val++;
        lblNumber.setText(
            Integer.toString(val));
    }

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // Required by Initializable interface
        // Called to initialize a controller after
        // the root element has been processed
    }
}