我使用JavaFX编写了推箱子游戏的代码，但没有完成， 这里包括三个部分，第一个是初始化，如您所见，还有两个功能。 当我运行程序时，它会产生很多错误，这是第一次 我得到这样的Java错误，我认为这不是语法错误，请 如果您知道如何解决此问题，请给我您的反馈。
public class Main extends Application {
private double width = 32*20;
private double height = 32*20;
private int[][] grid;
private int[][] targets;
private Image image = new Image("man.png");
private ImageView man = new ImageView(image);
private ArrayList<ImageView> boxList = new ArrayList<ImageView>();
private Pane warehouse;
public void warehouseInitialize(){
warehouse.getChildren().clear();
int[][] tempGrid = { {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,2,0,0,1,1,1,1,1,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1},
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}};
this.grid = tempGrid;
int [][] tempTargets = {{3,3},{18,18},{16,5}};
this.targets = tempTargets;
warehouse.setStyle("-fx-background-color:green");
for(int row=0;row<20;row++){
for(int col=0;col<20;col++){
if(grid[row][col] == 1){
ImageView stone = new ImageView(new Image("stone.png"));
stone.setX(row*32);
stone.setY(col*32);
warehouse.getChildren().add(stone);
}else if(grid[row][col] == 2){
ImageView box = new ImageView(new Image("box.png"));
box.setX(row*32);
box.setY(col*32);
warehouse.getChildren().add(box);
boxList.add(box);
}
}
}
man.setX(10*32);
man.setY(10*32);
warehouse.getChildren().add(man);
for(int i=0;i<targets.length;i++){
Circle circle = new Circle();
circle.setRadius(16);
circle.setCenterX(tempTargets[i][i] * 32);
circle.setCenterY(tempTargets[i][i+1]*32);
circle.setStyle("-fx-stroke:red; -fx-fill:blue;");
warehouse.getChildren().add(circle);
}
}
@Override
public void start(Stage primaryStage)throws Exception{
MenuBar menuBar = new MenuBar();
Menu menu1 = new Menu("Tool");
menuBar.getMenus().add(menu1);
MenuItem menu12 = new MenuItem("Reset");
menu1.getItems().add(menu12);
menu12.setOnAction(e->{
warehouseInitialize();
});
primaryStage.setTitle("Sokoban");
primaryStage.setWidth(width);
primaryStage.setHeight(height + menuBar.getHeight() + 64);
primaryStage.setResizable(false);
VBox vBox = new VBox(menuBar,warehouse);
Scene scene = new Scene(vBox,800,800);
scene.setOnKeyPressed(e->{
switch(e.getCode()){
/*case UP:
//goUp();
break;
case DOWN:
//goDown();
break;
case RIGHT:
//goRight();
break;*/
case LEFT:
goLeft();
break;
}
});
}
public void goLeft(){
int left1 = (int)((man.getX() - 32) / 32);
int left2 = (int)((man.getX() - 64) / 32);
int y = (int)(man.getY() / 32);
if(grid[y][left1] == 0){
man.setX(left1*32);
man.setY(y*32);
}else if(grid[y][left1] == 2 && grid[y][left2]==0){
man.setX(left1*32);
man.setY(y*32);
for(ImageView box :boxList){
int x_b = (int)(box.getX() / 32);
int y_b = (int)(box.getY() / 32);
if(x_b == y && y_b == left2 + 1){
box.setX(y*32);
box.setY(left2 * 32);
}
}
}
}
}
运行程序时出现一些错误：
Exception in Application constructor
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)atsun.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)atcom.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)
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$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class sample.Main
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:907)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$160(LauncherImpl.java:819)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
... 1 more
Caused by: java.lang.IllegalArgumentException: Invalid URL: Invalid URL or resource not found
at javafx.scene.image.Image.validateUrl(Image.java:1118)
at javafx.scene.image.Image.<init>(Image.java:620)
at sample.Main.<init>(Main.java:24)
... 13 more
Caused by: java.lang.IllegalArgumentException: Invalid URL or resource not found
at javafx.scene.image.Image.validateUrl(Image.java:1110)
... 15 more
Exception running application sample.Main
答案 0 :(得分：0)
错误是：
Caused by: java.lang.IllegalArgumentException: Invalid URL: Invalid URL or resource not found
代码中的要点在这里：
at sample.Main.<init>(Main.java:24)
如果我正确的话，请参考以下行：
private Image image = new Image("man.png");
问题是找不到man.png。但是，根据this question，有两种可能的解决方法。首先，try this：
private Image image = new Image("/sample/man.png");
默认情况下，Image的根是src目录。
如果失败，请this might work：
private File file = new File("C:\\Users\\Yusuf\\Desktop\\Foundation of Multimedia\\lab\\Sokoban\\src\\sample\\man.png");
private Image image = new Image(file.toURI().toString());
在这里，我们创建一个指向所需文件的File对象，然后使用toURI()获取URI。您可能可以使用以下命令跳过File对象：
private Image image = new Image("file://C/Users/Yusuf/Desktop/Foundation of Multimedia/lab/Sokoban/src/sample/man.png");
但是，转义空格字符可能存在问题，因此使用中间File对象可能更容易。
答案 1 :(得分：0)
stacktrace非常详细，并提供了足够的信息以进行调试。您可能会看到caused by的序列，这意味着较高的异常是由其下方的异常引起的。
因此，最有可能在您指定的位置找不到您的图片。请重新检查，并考虑检查有关相对路径的某些内容。
答案 2 :(得分：0)
该错误是由于错误的图像路径引起的。要测试您的代码，您可以使用网络资源：
Image image = new Image("https://candytech.in/wp-content/uploads/2018/04/man-1.png");
ImageView man = new ImageView(image);
当private Image image = new Image("man.png");与man.png位于同一文件夹中时，发布的代码Main应该可以使用。
与此问题无关：warehouse从未初始化。