应用程序启动方法中的JavaFx异常和应用程序启动方法中的异常

我创建了这个javaFx类来洗牌并从不同角度显示扑克牌。但突然我犯了一个错误。我试着把它修好，但还是不能使它工作。下面的代码给出了代码解释。 该程序假设随机选取png卡图像并显示在第一行。第二行显示三张不同角度的小丑牌。第三行以3个不同的角度显示另外3张不同的卡

代码：

import java.util.ArrayList;
import java.util.Random;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

//Creating class JavaFXCardGUI which is extending Application class
//Now JavaFXCardGUI class will act as an JavaFX Application
public class JavaFXCards extends Application{

   //Overriding start method of Application class which is always a starting point of any JavaFX Application
   @Override
   public void start(Stage stage) throws Exception {

       //Creating a VBox object
       VBox vBox=new VBox();
       //Setting its spacing and padding
       vBox.setSpacing(50);
       vBox.setPadding(new Insets(20, 40, 40, 60));

       //Creating a HBox object which will store the first row cards and setting its spacing property
       HBox firstRowHBox=new HBox();
       firstRowHBox.setSpacing(50);

       //Creating a HBox object which will store the second row cards and setting its spacing property
       HBox secondRowHBox=new HBox();
       secondRowHBox.setSpacing(50);

       //Creating a HBox object which will store the third row cards and setting its spacing property
       HBox thirdRowHBox=new HBox();
       thirdRowHBox.setSpacing(50);

       //Creating a arraylist of unique 52 cards which will store the each card number
       //If that card number will be already present in the arraylist then that card will not be added
       ArrayList<Integer> lstUnique52Cards=new ArrayList<Integer>();

       //Creating a random class object
       Random random=new Random();

      //This loop will add the three cards in first row
       while(lstUnique52Cards.size()<3) {
           //Generate a randomNumber between 1 and 52 both inclusive
           //Since random.NextInt(52) will return number from 0 to 51 Hence adding 1 to
           //make it from 1 to 52
           int randomNumber=random.nextInt(52)+1;

           //If the current random generated is not present in the array list lstUnique52Cards
           //it means that the random number is unique then add that random number in array list lstUnique52Cards
           //then create the correpsonding ImageView with the card number represented by randomNumber
           //Then add the image to the firstRowHBox
           if(!lstUnique52Cards.contains(randomNumber)) {
               lstUnique52Cards.add(randomNumber);
               ImageView imgViewCard=new ImageView(new Image("c:\\Users\\Desktop\\Tempory\\card"+randomNumber+".png"));
               firstRowHBox.getChildren().add(imgViewCard);
           }
       }

      //This loop will add the three joker cards in second row
       //Here the uniqueness doesn't matter for the card
       for(int i=1;i<=3;i++) {
           //Below statement random.nextInt(2) will generate two random numbers 0 and 1 only as we are having
           //only two joker cards. Since two joker cards images number are 53.png and 54.png.
           //Hence adding 53 to get that correpsonding joker card number
           int randomNumber=random.nextInt(2)+53;

           //Creating ImageView object with the given card number image
           ImageView imgViewCard=new ImageView(new Image("c:\\Users\\Desktop\\Tempory\\card"+randomNumber+".png"));

           //If the value of i is 1 i.e. it is first card then set the rotation angle as 45
           if(i==1)
               imgViewCard.setRotate(45);

           //If the value of i is 2 i.e. it is second card then set the rotation angle as 90
           if(i==2)
               imgViewCard.setRotate(90);

           //If the value of i is 3 i.e. it is third card then set the rotation angle as 135
           if(i==3)
               imgViewCard.setRotate(135);

           //Add the imgViewCard in secondRowHBox
           secondRowHBox.getChildren().add(imgViewCard);
       }

       //This loop will add the three more unique cards
       //Initializing cardNumber with 1
       int cardNumber=1;
       while(lstUnique52Cards.size()<6) {
           //Generate a randomNumber between 1 and 52 both inclusive
           //Since random.NextInt(52) will return number from 0 to 51 Hence adding 1 to
           //make it from 1 to 52
           int randomNumber=random.nextInt(52)+1;

           //If the current random generated is not present in the array list lstUnique52Cards
           //it means that the random number is unique then add that random number in array list lstUnique52Cards
           //then create the correpsonding ImageView with the card number represented by randomNumber
           //Also set the correpsonding angle to the cardNumber of this thirdRowHBox
           //Then add the image view card to the thirdRowHBox
           if(!lstUnique52Cards.contains(randomNumber)) {
               lstUnique52Cards.add(randomNumber);
               ImageView imgViewCard=new ImageView(new Image("c:\\Users\\Desktop\\Tempory\\card"+randomNumber+".png"));
               if(cardNumber==1)
                   imgViewCard.setRotate(135);
               if(cardNumber==2)
                   imgViewCard.setRotate(90);
               if(cardNumber==3)
                   imgViewCard.setRotate(45);
               thirdRowHBox.getChildren().add(imgViewCard);
               cardNumber++; //Increment cardNumber by 1
           }
       }

       //Add all the three HBox objects in the vBox
       vBox.getChildren().add(firstRowHBox);
       vBox.getChildren().add(secondRowHBox);
       vBox.getChildren().add(thirdRowHBox);

       //Create a scene object with the child as vBox
       Scene scene = new Scene(vBox ,450, 450);

       //Setting the stage title as Cards
       stage.setTitle("Cards");

       //Setting the scene to the stage
       stage.setScene(scene);

       //Showing the stage
       stage.show();
   }

   //Main method it will invoke start method of Application class
   public static void main(String[] args) {
       launch(args);
   }
}

ant -f c:\Users\Desktop\Tempory\card jfxsa-run
init:
Deleting: c:\Users\Desktop\Tempory\card\build\built-jar.properties
deps-jar:
Updating property file: c:\Users\Desktop\Tempory\card\build\built-jar.properties
compile:
Detected JavaFX Ant API version 1.3
jfx-deployment:
jar:
Copying 12 files to c:\Users\Desktop\Tempory\card\dist\run395293642
jfx-project-run:
Executing c:\Users\Desktop\Tempory\card\dist\run395293642\JavaFXCards.jar using platform C:\Program Files\Java\jdk1.8.0_221\jre/bin/java
Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$1(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
    at javafx.scene.image.Image.validateUrl(Image.java:1121)
    at javafx.scene.image.Image.<init>(Image.java:620)
    at JavaFXCardGUI.start(JavaFXCardGUI.java:58)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$7(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$3(WinApplication.java:177)
    ... 1 more
Caused by: java.net.MalformedURLException: unknown protocol: c
    at java.net.URL.<init>(URL.java:607)
    at java.net.URL.<init>(URL.java:497)
    at java.net.URL.<init>(URL.java:446)
    at javafx.scene.image.Image.validateUrl(Image.java:1115)
    ... 11 more
Exception running application JavaFXCardGUI
Java Result: 1
Deleting directory c:\Users\Desktop\Tempory\card\dist\run395293642
jfxsa-run:
BUILD SUCCESSFUL (total time: 2 seconds)

import java.util.ArrayList；
导入java.util.Random；
导入javafx.application.application；
导入javafx.geometry.Insets；
导入javafx.scene.scene；
导入javafx.scene.image.image；
导入javafx.scene.image.ImageView；
导入javafx.scene.layout.HBox；
导入javafx.scene.layout.VBox；
导入javafx.stage.stage；
//创建扩展应用程序类的JavaFXCardGUI类
//现在JavaFXCardGUI类将充当JavaFX应用程序
公共类JavaFXCards扩展了应用程序{
//重写Application类的start方法，该方法始终是任何JavaFX应用程序的起点
@凌驾
public void start（Stage）引发异常{
//创建VBox对象
VBox VBox=新的VBox（）；
//设置其间距和填充
vBox.setspace（50）；
vBox.setPadding（新插图（20,40,40,60））；
//创建将存储第一行卡的HBox对象并设置其间距属性
HBox firstRowHBox=新的HBox（）；
firstRowHBox.setSpacing（50）；
//创建将存储第二行卡的HBox对象并设置其间距属性
HBox secondRowHBox=新的HBox（）；
第二行HBox.setSpacing（50）；
//创建将存储第三行卡的HBox对象并设置其间距属性
HBox thirdRowHBox=新的HBox（）；
thirdRowHBox.setspace（50）；
//创建一个包含唯一52张卡的arraylist，该列表将存储每个卡号
//如果该卡号已存在于arraylist中，则不会添加该卡
ArrayList lstUnique52Cards=新的ArrayList（）；
//创建随机类对象
随机=新随机（）；
//此循环将在第一行中添加三张卡
while（lstUnique52Cards.size（）MalformedURLException-您提供了一个错误的URL字符串；您需要做的就是在图像路径之前添加“file:”，如下-
新图像（“file:c:\\Users\\Desktop\\Tempory\\card”+randomNumber+.png”）
。
请记住始终使用
文件：
协议作为本地文件路径的前缀。
图像文件路径前面的文件协议缺失：

ImageView imgViewCard=new ImageView(new Image("file:\\\c:\\Users\\Desktop\\Tempory\\card"+randomNumber+".png"));

对于任何想知道Op提到的代码在哪里的人来说：Op编辑的问题已不再是主题问题；我的回滚已立即撤消。但是，您仍然可以在修订历史中看到问题的原始版本：请停止删除代码。这会使您的问题对其他用户无用。