JavaFx Stage未出現

Question

我正在嘗試顯示一個舞台，但似乎沒有加載任何內容。 編譯不會顯示任何錯誤，但是不會加載任何內容。 任何幫助表示贊賞！ 謝謝！ ：）重要的一點是，當運行的是JavaFX時，什么也沒有加載。 完全沒有 我真的不明白這個程序有什么問題。

package EventClick;


/**
 * Write a description of class databaseq here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
import EventClick.adminLogin.*;
import javafx.application.*;
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.geometry.*;
import java.util.*;
import javafx.util.Duration;
import javafx.animation.PauseTransition;

public class databaseq extends Application {
    Stage stage;
    Stage stage2;

    @Override public void start(Stage primaryStage) {
        stage = primaryStage;
        Platform.setImplicitExit(false);
        //Create Login Button
        Button loginbtn = new Button();
        loginbtn.setText("Login");
        loginbtn.setOnAction(e -> loginOn_Click());

        //Create Credentials Button
        Button credbtn = new Button();
        credbtn.setText("Credentials");
        credbtn.setOnAction(e -> credOn_Click());

        //Create Close Button
        Button closebtn = new Button();
        closebtn.setText("Quit");
        closebtn.setOnAction(e -> closeOn_Click());
        //Add buttons to a layout pane
        VBox pane = new VBox(10);
        pane.getChildren().addAll(loginbtn, credbtn, closebtn);
        pane.setAlignment(Pos.CENTER);

        //Add layout pane to a scene
        Scene scene = new Scene(pane, 250, 150);
        Scene scene2 = new Scene(pane, 250, 150);
        //Finish and show the scene

        primaryStage.setScene(scene);
        primaryStage.setTitle("Test Server");
        primaryStage.show();
    }

    public void loginOn_Click() {
       Alert a = new Alert(Alert.AlertType.CONFIRMATION,"Do you want to log in?",
                                                        ButtonType.YES, ButtonType.NO);        
        Optional<ButtonType> confirm = a.showAndWait();
        if(confirm.isPresent() && confirm.get() == ButtonType.YES) {

        }
    }
    public void credOn_Click() {
        Alert a = new Alert(Alert.AlertType.INFORMATION);
        a.setTitle("Test Server");
        a.setHeaderText("Loading Credentials...");
        a.setContentText("Entering User Login Server");

        a.showAndWait();
    }

    public void closeOn_Click() {
        Alert a = new Alert(Alert.AlertType.CONFIRMATION,"Are you sure you want to quit?",
                                                        ButtonType.YES, ButtonType.NO);
        Optional<ButtonType> confirm = a.showAndWait();
        if(confirm.isPresent() && confirm.get() == ButtonType.YES) {
            stage.close();
        }
    }
}

Answer 1

 //Add layout pane to a scene
    Scene scene = new Scene(pane, 250, 150);
    Scene scene2 = new Scene(pane, 250, 150);

這是使程序混亂的代碼。 由於某種原因，一次加載兩個場景會使顯示混亂。