Can you return the color of a rectangle object in java?

问题

For example, I create a rectangle object and set its fill to black. Would I be able to check the fill color of the rectangle to determine if its white or black? Something like:

Rectangle r = new Rectangle(10.0, 10.0, 10.0, 10.0);

if (r.getFill == 'BLACK') {
    r.setFill(Color.'PURPLE');
}

回答1:

The getFill() method returns a Paint object. Therefore, you should use equals for comparison:

Rectangle r = new Rectangle(1.0, 1.0, Color.WHITE);

if (r.getFill().equals(Color.WHITE)) {
    System.out.println("That's a white rectangle.");
}

回答2:

Assuming you mean the Rectangle that is a subclass of javafx.scene.shape.Shape, then yes, there is a method named getFill that returns a Paint (Documentation)

来源：https://stackoverflow.com/questions/40196753/can-you-return-the-color-of-a-rectangle-object-in-java