java - 尝试将 Swing 转换为 Java-FX

Question

这是我使用 Swing 时的代码片段:

private static Gui gui;

public static void main(String[] args){
    gui = new Gui(); //(1)
    gui.menu();      //(2)
    gui.show();      //(3)
}

1. 构造函数初始化JFrame
2. 创建 JLabel 和 JPanel 并将它们添加到框架中。
3. 将框架可见性设置为 true。

我一直在尝试，但无法使用 Java-FX 获得我想要的结果。这是我最后一次尝试的样子:

private static Gui gui;

public static void main(String[] args){
    gui = new Gui();
    Application.launch(Gui.class, args);
    gui.menu();
    gui.show();
}

GUI 类:

private static Stage stage;

public class Gui extends Application {

    publc void start(Stage primaryStage){

    Gui.stage = primaryStage;
    stage.setTitle("title");

    //I read that some method blocking is involved here, I want to go back!
    }

    public void menu(){

    BorderPane abc = new BorderPane();
    Scene scene = new Scene(abc, 200, 200);
    stage.setScene(scene);

    //if I somehow mange to reach this part, there will be some null pointer
    //exception, well everything looks real initialised to me
    }

    public void show(){

    stage.show();

    //I have never reach this part
    }
}

Answer 1

最简单的方法是使用 Application.launch(_:_:) 如下:

package gui;

import javafx.application.Application;


public class NewClass {
    public static void main(String[] args) {
        Application.launch(Gui.class, args);
    }
}

– 让你的类(class)像这样:

package gui;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class Gui extends Application {
    private Scene scene;
    private Stage stage;
    
    @Override
    public void start(Stage stage) {
        this.stage = stage;
        Button btn = new Button("test");
        this.scene = new Scene(btn, 200, 250);
        stage.setTitle("title");
        stage.setScene(scene);
        stage.show();
    }
    
    public void menu() {
        BorderPane abc = new BorderPane();
        this.scene = new Scene(abc, 200, 200);
        this.stage.setScene(scene);

        // If I somehow manage to reach this part, there will be a NullPointerException
        // Everything looks real initialised to me
    }
}

还有更多样本here您想要实现的目标。