import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Modality;
import javafx.stage.Stage;

public class AlertBox
{
    public void display(String poruka, String naslov)
    {
        Stage abox = new Stage();
        abox.setTitle(naslov);
        abox.setMinHeight(250);
        abox.setMinWidth(250);

        abox.initModality(Modality.APPLICATION_MODAL);

        Label prk = new Label(poruka);

        Button button = new Button("Zatvori prozor");

        button.setOnAction(e -> abox.close());

        VBox layout = new VBox();

        layout.getChildren().addAll(prk, button);
        layout.setAlignment(Pos.CENTER);

        Scene scene = new Scene(layout , 250, 250);

        abox.setScene(scene);
        abox.showAndWait();
    }
}