了解Javafx运行时错误 [英] Understanding Javafx runtime errors
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问题描述
我使用JavaFX编写了推箱子游戏的代码，但没有完成，这里包含三个部分，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，请给我您的反馈意见.
I wrote code for Sokoban game by using JavaFX but not completed one, here has three parts, first initialization, two more functions as you see. When I run the program, it makes a bunch of errors and it is the first time for me to get such java errors, I think this is not a syntax error, please give me your feedback if you know how to solve this, thanks.
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:
Here some errors when I run the program:
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
推荐答案
该错误归因于错误的图像路径.要测试您的代码，您可以使用网络资源:
The error is due to wrong image path. To test you code you can use a web resource :
Image image = new Image("https://candytech.in/wp-content/uploads/2018/04/man-1.png");
ImageView man = new ImageView(image);
发布的代码 private Image image = new Image("man.png"); 应该在 man.png 与 Main位于同一文件夹中时起作用.
与此问题无关:仓库从未初始化.
The posted code private Image image = new Image("man.png"); should work when man.png is in the same folder as Main.
Not related to the question: warehouse is never initialized.
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