JavaFX接受特定对象类型的组

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JavaFX中是否有一种方法可以创建一个扩展 Group 的类，并将其限制为仅接受 Shape 对象作为孩子？

Is there a way in JavaFX to make a class that extends Group and limit it to accepting only Shape objects as children?

推荐答案

考虑创建一个包装类而不是子类。

Consider creating a wrapper class instead of a subclass. Something along the lines of

public class ShapeGroup { private final Group group = new Group() ; public void addShape(Shape s) { group.getChildren().add(s); } public void removeShape(Shape s) { group.getChildren().remove(s); } // other methods you want to expose, implemented similarly... public Parent asParent() { return group ; } }

现在你可以按如下方式使用：

And now you can use this as follows:

ShapeGroup shapeGroup = new ShapeGroup(); shapeGroup.addShape(new Circle(50, 50, 20)); shapeGroup.addShape(new Rectangle(20, 20, 30, 30)); // ... Scene scene = new Scene(shapeGroup.asParent()); // etc..