buttonDownload.setStyle("-fx-background-image: url('/images/verified.png')");

new Thread(() -> {
    Image resim = uzunSürenBirİşlem();
    imageView.setImage(resim); // Bu udurmda thread ile FX yapısı kesişir ve hata verir
}).start();
​
new Thread(() -> {
    Image resim = uzunSürenBirİşlem();
    Platform.runAfter(() -> imageView.setImage(resim)); // Yapısı ile FX hazır olduktan sonra işlem yapılır
}).start();

<TextField prefWidth="50" text="${speedSlider.value}"/> <!-- Inline code -->
<Slider fx:id="speedSlider" orientation="HORIZONTAL" prefWidth="300"
        min="60" max="100000" blockIncrement="100"/>

// Listener örneği
sliderQuality.valueProperty().addListener((observableValue, number, t1) -> {
    updateFileSize();
});

primaryStage.initStyle(StageStyle.TRANSPARENT);

primaryStage.setScene(new Scene(root));
primaryStage.getScene().setFill(Color.TRANSPARENT);

private void putClipboard(String clipboardString) {
    StringSelection stringSelection = new StringSelection(clipboardString);
    Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
    clipboard.setContents(stringSelection, null);
}
​
String getClipboard() throws IOException, UnsupportedFlavorException {
    Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
    return (String) clipboard.getData(DataFlavor.stringFlavor);
}

import javafx.scene.image.Image;
​
// load an image in background, displaying a placeholder while it's loading
// (assuming there's an ImageView node somewhere displaying this image)
// The image is located in default package of the classpath
Image image1 = new Image("/flower.png", true);
​
// load an image and resize it to 100x150 without preserving its original
// aspect ratio
// The image is located in my.res package of the classpath
Image image2 = new Image("my/res/flower.png", 100, 150, false, false);
​
// load an image and resize it to width of 100 while preserving its
// original aspect ratio, using faster filtering method
// The image is downloaded from the supplied URL through http protocol
Image image3 = new Image("http://sample.com/res/flower.png", 100, 0, false, false);
​
// load an image and resize it only in one dimension, to the height of 100 and
// the original width, without preserving original aspect ratio
// The image is located in the current working directory
Image image4 = new Image("file:flower.png", 0, 100, false, false);

@FXML
private ImageView imageView;
​
@FXML
void handleDragOver(DragEvent event) {
    if (event.getDragboard().hasFiles()) {
        event.acceptTransferModes(TransferMode.ANY);
    }
}
​
@FXML
void handleDragDropped(DragEvent event) throws FileNotFoundException {
    List<File> files = event.getDragboard().getFiles();
    Image img = new Image(new FileInputStream(files.get(0)));
    imageView.setImage(img);
}