我正在开发一个Java swing应用程序,在该应用程序中,我试图为国际象棋棋子加载图像,并且一切工作得很好,直到突然之间,我收到错误消息:
Exception in thread "main" java.lang.StackOverflowError
at java.base/java.lang.String.indexOf(String.java:1612)
at java.base/java.lang.String.indexOf(String.java:1569)
at java.base/java.net.URLStreamHandler.parseURL(URLStreamHandler.java:151)
at java.base/sun.net.www.protocol.file.Handler.parseURL(Handler.java:67)
at java.base/java.net.URL.<init>(URL.java:696)
at java.base/java.net.URL.<init>(URL.java:563)
at java.base/jdk.internal.loader.URLClassPath$FileLoader.getResource(URLClassPath.java:1222)
at java.base/jdk.internal.loader.URLClassPath$FileLoader.findResource(URLClassPath.java:1211)
at java.base/jdk.internal.loader.URLClassPath.findResource(URLClassPath.java:294)
at java.base/jdk.internal.loader.BuiltinClassLoader.findResourceOnClassPath(BuiltinClassLoader.java:499)
at java.base/jdk.internal.loader.BuiltinClassLoader.findResource(BuiltinClassLoader.java:323)
at java.base/java.lang.ClassLoader.getResource(ClassLoader.java:1400)
at java.base/java.lang.Class.getResource(Class.java:2741)
at model.Board.getImageIcon(Board.java:246)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
,并且at model.Board.setBoard(Board.java:49)
中的部分之后(仅该部分)被记录了很多次。
在调试错误时,我看到它反复输入相同的方法,直到发生堆栈溢出错误为止。在那里,我正在从本地地址检索图像。
方法如下:
private ImageIcon getImageIcon(String path,String description) {
URL imgURL = getClass().getResource(path);
if (imgURL != null) {
Image ii=new ImageIcon(imgURL, description).getImage().getScaledInstance(70, 70, Image.SCALE_SMOOTH);
ImageIcon im=new ImageIcon(ii);
return im;
}
else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
它叫做
public void setBoard(Color c1,Color c2,Dimension dim) {
for(int i=0;i<8;i++) {
for(int j=0;j<8;j++) {
Point point=new Point(i,j);
if ((i+j)%2==0) {
if(i==0 && j==0) {
***Figure f=new Figure (null,null,"white_rook",null,getImageIcon("/images/WhiteRook.png",null));***
fields[i][j]=new Field(c1,new Position(point.x,point.y),i*8+j,f);
f.field=fields[i][j];
f.pos=new Position(point.x,point.y);
fields[i][j].add(f);
figures[i][j]=f;
}
是方法setBoard的一部分,基本上将每个部分放在字段上。图类看起来像:
public class Figure extends JPanel {
public Field field;
public Color color;
public String name;
public Movement movement;
public ImageIcon imageIcon;
public Position pos;
public Figure(Field field, Color color, String name, Movement movement, ImageIcon icon) {
this.field = field;
this.color = color;
this.name = name;
this.movement = movement;
this.imageIcon = icon;
this.setPreferredSize(new Dimension(70, 70));
this.addMouseMotionListener(new FigureAction());
this.addMouseListener(new FigureAction());
this.setBackground(null);
}
}
在这里,我正在从png图像制作缩放后的imageIcon并将其取回。如果有人能够告诉我可能是什么问题,我将不胜感激。我想我在这里错过了一些重要的事情,但目前不知道该去哪里看看。.预先感谢。
答案 0 :(得分:2)
第一个getClass()
实际上可能是一个子类,因此为了有条理:
URL imgURL = Board.class.getResource(path);
然后,优化内存使用率和速度。我在这里忽略了描述。
Map<String, ImageIcon> sharedIcons = new HashMap<>();
private ImageIcon getImageIcon(String path, String description) {
ImageIcon icon = sharedIcons.get(path);
if (icon == null) {
URL imgURL = getClass().getResource(path);
if (imgURL == null) {
System.err.println("Couldn't find file: " + path);
return null;
}
icon = new ImageIcon(imgURL, description);
Image ii = new ImageIcon(imgURL, description)
.getImage().getScaledInstance(70, 70, Image.SCALE_SMOOTH);
icon = new ImageIcon(ii);
sharedIcons.put(path, icon);
}
return icon;
}
检查是否没有递归。 FigureAction
呼叫setBoard
左右。
答案 1 :(得分:1)
根据您提供的堆栈跟踪和代码:
$bucketAuto
这意味着:
at model.Board.setBoard(Board.java:49)
at model.Board.<init>(Board.java:37)
at model.Board.getBoardInstance(Board.java:28)
at controler.FigureAction.<init>(FigureAction.java:15)
at model.Figure.<init>(Figure.java:30)
构造函数被调用。Figure
构造函数。FigureAction
。Board.setBoard
在刚刚用3个星号突出显示的行中再次调用Board.setBoard
构造函数... 为了解决这个问题,这取决于您要实现的目标。这意味着,如果您希望我们尝试解决它,我们甚至需要更多代码来查看(例如MRE)。