一个洗牌的程序，当我点击洗牌按钮时，牌会在GUI窗口上消失

Question

到目前为止，我所有的代码都编译得很好，但是洗牌按钮使所有的牌都消失了

import java.util.Random;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.image.ImageView;
import javafx.scene.layout.*;
import javafx.scene.control.Button;
import javafx.geometry.Pos;

public class P6 extends Application
{
    public static final int ASIZE = 54;
    public static final int ROWS = 6;
    public static final int COLS = 9;

    public void start(Stage primaryStage)
    {
        int aCardDeck[] = new int[ASIZE];       //54 cards in a deck
        for( int i = 0 ; i < ASIZE ; i++ )  //ASIZE is 54
        aCardDeck[i] = i + 1;       //populate with elements 1-54

        GridPane gPane = new GridPane();        //Instantiate Grid for cards in rows/cols

        for( int i = 0, k = 0 ; i < ROWS && k < ASIZE; i++ )  //6 rows, 9 columns 
            for( int j = 0; j < COLS ; j++ )
            gPane.add(new ImageView("image/card/" + aCardDeck[k++] + ".png"),j,i);



        Button btShuffle = new Button("Shuffle");
        btShuffle.setOnAction
        ( e ->                  // Lamda Event Handler
        {                   // Like anonymous inner class
        int r, c, n;
        shuffle( aCardDeck );       // Random shuffle
        gPane.getChildren().clear();
        for ( r = n = 0; r < ROWS && n < ASIZE; r++)
        for (c = 0; c < COLS ; c++)
        gPane.add(new ImageView("~/../public/image/card/" + aCardDeck[n++]
        + ".png"),c,r);
        }
        ); 

        HBox hBox = new HBox(5);            // Row of buttons
        hBox.getChildren().add( btShuffle );    // Add button to box


        BorderPane pane = new BorderPane();
        pane.setCenter(gPane);          // Layout rows of cards in center
        pane.setBottom(hBox);           // Layout buttons at bottom
        BorderPane.setAlignment(hBox, Pos.CENTER);
        Scene scene = new Scene(pane, 650, 600); // Create scene, place in stage
        primaryStage.setTitle("P6");        // Set the stage title
        primaryStage.setScene(scene);       // Place the scene in the stage
        primaryStage.show();            // Display the stage
        }

    public void ascendSort (int [] a){}
    public void descendSort (int [] a){}
    public void ascendRankSort (int [] a){}
    public void descendRankSort (int [] a){}

    public void shuffle( int [] a ){
        int r, tmp;
        Random rand = new Random();
        long seed = System.currentTimeMillis();
        rand.setSeed(seed);
        for( int i = 0 ; i < ASIZE ; i++ ){
        r = rand.nextInt(ASIZE);

        tmp = a[r];
        a[r] = a[i];
        a[i] = tmp; 
}
}
    public static void main(String[] arg`enter code here`s)
    {
    launch(args);
    }
}

错误消息：线程“JavaFX Application thread”Java.lang.IllegalArgumentException：无效URL：在javafx.scene.image.image.validateurl（image.Java:1094)在javafx.scene.image.image（image.Java:598)在javafx.scene.image.image.image.view（imageview.Java:164)在p6.lambda$start$0（p6.lambda$lambda$1/16273898（imageview.Java:164)在Dispatcher.DispatchEvent（BasicEventDispatchChainImpl.DispatchEvent（EventDispatchChainImpl.java：114）（BasicEventDispatchEvent（BasicEventDispatchEvent（BasicEventDispatchEvent：56）（BasicEventDispatchEvent：56）（BasicEventDispatchEvent（BasicEventDispatchEvent：56）（BasicEventDispatchEvent（EventDispatchChainImpl.java：114在com.sun.javafx.event.CompositeEventHandler.DispatchBubblingEvent（CompositeEventHandler.java:80)在com.sun.javafx.event.EventHandlerManager.DispatchBubblingEvent（EventHandlerManager.java:238)在com.sun.javafx.event.EventHandlerManager.DispatchBubblingEvent（EventHandlerManager.java:191)在com.sun.javafx.event.CompositeEventDispatchEvent（ventutil.java:74)在com.sun.javafx.event.eventutil.fireevent（event.java:54)在javafx.scene.scene$mousehandler.process（scene.java:3746)在javafx.scene.scene$mousehandler.access$1800（scene.java:3471)在javafx.scene.scene.impl_processmouseevent（scene.java:1695)在javafx.scene.scene$scenePeerListener.mouseevent（n.java:48)在com.sun.glass.ui.gtk.gtkApplication$6$1.在java.lang.Thread.Run(gtkApplication.java:149)在java.lang.IllegalArgumentException：无效URL或在javafx.scene.image.image.validateurl(image.java:1086)找不到资源

Answer 1

好吧，我想我有一个答案，但我还没有测试过，所以我不确定。

但我相信你的问题是编码不一致。

下面是您在开始填充GPANE时使用的行：

gPane.add(new ImageView("image/card/" + aCardDeck[k++] + ".png"),j,i);

这是随机化后使用的线：

gPane.add(new ImageView("~/../public/image/card/" + aCardDeck[n++]
        + ".png"),c,r);

我认为您遇到的问题是public/image/card是错误的路径，您需要对其进行更改，使其与以前的路径相同。另外，我将使它成为refresh方法，而不是到处复制那一行代码。因此，您将在每次更改数组时调用refresh方法，而不是在任何地方复制+粘贴gpane.add(...)。