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package javafxui;import javafx.beans.value.ObservableValue;import javafx.scene.Scene;import javafx.scene.control.Label;import javafx.scene.control.ScrollPane;import javafx.scene.image.Image;import javafx.scene.image.ImageView;import javafx.scene.layout.Priority;import javafx.scene.layout.VBox;import javafx.stage.Stage;import javafx.application.Application;public class LearnUI extends Application {    final ScrollPane sp = new ScrollPane();    final Image[] images = new Image[5];    final ImageView[] pics = new ImageView[5];    final VBox vb = new VBox();    final Label fileName = new Label();    final String [] imageNames = new String [] {"/res/pic1.jpg", "/res/pic2.jpg",        "/res/pic3.jpg", "/res/pic4.jpg", "/res/pic5.jpg"};    @Override    public void start(Stage stage) {        VBox box = new VBox();        Scene scene = new Scene(box, 180, 180);        stage.setScene(scene);        stage.setTitle("Scroll Pane");        box.getChildren().addAll(sp, fileName);        VBox.setVgrow(sp, Priority.ALWAYS);        fileName.setLayoutX(30);        fileName.setLayoutY(160);        for (int i = 0; i < 5; i++) {            images[i] = new Image(getClass().getResourceAsStream(imageNames[i]));            pics[i] = new ImageView(images[i]);            pics[i].setFitWidth(100);            pics[i].setPreserveRatio(true);            vb.getChildren().add(pics[i]);        }        sp.setVmax(440);        sp.setPrefSize(115, 150);        sp.setContent(vb);        //ImageView对象限制图片的高为100像素。因此new_val.intValue()-1除以100的值就是在imageNames数组中当前图片的索引值。        sp.vvalueProperty().addListener((ObservableValue
    ov,             Number old_val, Number new_val) -> {                fileName.setText(imageNames[(new_val.intValue() - 1)/100]);        });        stage.show();    }    public static void main(String[] args) {        Application.launch(args);    }}

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