Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();

2 javafx

Rectangle2D screenRectangle = Screen.getPrimary().getBounds();
double width = screenRectangle.getWidth();
double height = screenRectangle.getHeight();

JavaFX获取屏幕尺寸

原文：https://blog.51cto.com/14415843/2500008