JavaFX，外部类扩展窗格，将其添加到主类不起作用 [英] JavaFX, external class extends pane, adding that to main class doesn't work

问题描述

JavaFX主类:

public class Test1 extends Application {

    @Override
    public void start(Stage stage) throws Exception {

       Pane sp = new Pane();
       SubClass sc = new SubClass();
       sc.c.setFill(Color.AQUA);
       sp.getChildren().add(sc);
       Scene scene = new Scene(sp, 250, 250);
       stage.setTitle("Testing");
       stage.setScene(scene);
       stage.show();
    }


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

}

这是我的另一堂课:

public class SubClass extends Pane
{   
   Circle c = new Circle(100.0f,100.0f,100.0f);
}

但是我看不到自己的圈子出现在我的输出中的任何地方.我的输出完全空白.有人可以指出我在做什么错吗?

But I don't see my circle appearing anywhere in my output. My output is completely blank. Can somebody point at what am I doing wrong?

这是我的输出窗口:

推荐答案

您的所有子类都将创建圆.它不会将其添加到任何地方的窗格中.要将其添加到窗格中，您需要在某处调用getChildren().add(...)；例如在构造函数中:

All your subclass does it create the circle. It doesn't add it to a pane anywhere. To add it to the pane, you need to call getChildren().add(...) somewhere; for example in the constructor:

public class SubClass extends Pane {   

   Circle c = new Circle(100.0f,100.0f,100.0f);

   public SubClass() {
        getChildren().add(c);
   }

}

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