Javafx resizable window

scene.widthProperty().addListener(new ChangeListener<Number>() {
    @Override public void changed(ObservableValue<? extends Number> observableValue, Number oldSceneWidth, Number newSceneWidth) {
        System.out.println("Width: " + newSceneWidth);
    }
});
scene.heightProperty().addListener(new ChangeListener<Number>() {
    @Override public void changed(ObservableValue<? extends Number> observableValue, Number oldSceneHeight, Number newSceneHeight) {
        System.out.println("Height: " + newSceneHeight);
    }
});

Source: blog.idrsolutions.com

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