随机元素

Question

进入堆叠后是否可以随机播放元素？ 所以，计划是每次都显示随机图像。 我的代码如下：

/*
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 */
package imagedisplay;

import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Duration;
/**
 *
 * @author D
 */
public class ImageDisplay extends Application {

    @Override
    public void start(Stage primaryStage) {
        Image Img1 = new Image("file:lib/1.jpg");
        Image Img2 = new Image("file:lib/2.jpg");
        Image Img3 = new Image("file:lib/3.jpg");
        Image Img4 = new Image("file:lib/4.jpg");
        ImageView ViewImg = new ImageView();
        Timeline tl = new Timeline(

                new KeyFrame(Duration.seconds(25), new KeyValue(ViewImg.imageProperty(), Img1)),
                new KeyFrame(Duration.seconds(20), new KeyValue(ViewImg.imageProperty(), Img2)),  
                new KeyFrame(Duration.seconds(15), new KeyValue(ViewImg.imageProperty(), Img3)),
                new KeyFrame(Duration.seconds(10), new KeyValue(ViewImg.imageProperty(), Img4)),   
                new KeyFrame(Duration.seconds(5), new KeyValue(ViewImg.imageProperty(), null)));
        tl.play();
        StackPane st = new StackPane();
        st.getChildren().add(ViewImg);
        primaryStage.setScene(new Scene(st, 800, 600));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

基本上这个代码的作用是，它逐个显示一些图像，每个图像持续5秒。我想展示他们，但是他们已经甩掉了。

Answer 1

Collections类有一个内置的shuffle方法。

Timeline tl = new Timeline(
    Collections.shuffle(Arrays.asList(
            new KeyFrame(Duration.seconds(25), new KeyValue(ViewImg.imageProperty(), Img1)),
            new KeyFrame(Duration.seconds(20), new KeyValue(ViewImg.imageProperty(), Img2)),  
            new KeyFrame(Duration.seconds(15), new KeyValue(ViewImg.imageProperty(), Img3)),
            new KeyFrame(Duration.seconds(10), new KeyValue(ViewImg.imageProperty(), Img4)),   
            new KeyFrame(Duration.seconds(5), new KeyValue(ViewImg.imageProperty(), null)))));