Java 存在的ImageIcon上的NullPointerException
我正在和几个朋友做一个基本的游戏。即使文件中存在png,尝试从类平铺加载和创建imageIcon图像也会引发nullPointerException 下面是调用该文件的board类Java 存在的ImageIcon上的NullPointerException,java,nullpointerexception,jframe,imageicon,Java,Nullpointerexception,Jframe,Imageicon,我正在和几个朋友做一个基本的游戏。即使文件中存在png,尝试从类平铺加载和创建imageIcon图像也会引发nullPointerException 下面是调用该文件的board类 public Board(String name){ super("Monopoly"); setLayout(new GridBagLayout()); die = new Dice(); andy = new Human(name, 1200, new ImageIcon("as
public Board(String name){
super("Monopoly");
setLayout(new GridBagLayout());
die = new Dice();
andy = new Human(name, 1200, new ImageIcon("assets/img/redBullet.png"));
blank = new ImageIcon("assets/img/white.png");
paid = false;
tile1 = new Tile(1,"normal", 100, new ImageIcon(getClass().getResource("assets/img/redBullet.png")));
然后它继续呼叫
tile1.getImage().paintIcon(board, getGraphics(),((int)andy.getPos().getX()), ((int)andy.getPos().getY()));
tile构造函数如下所示
public Tile(int Position, String Type, int Price, ImageIcon img)
{
position = Position;
type = Type;
price = Price;
image = img;
}
有任何帮助吗?这是tile1.getImage()行上的nullPointerException
编辑:
堆栈跟踪
第246行是调用方法
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.paintIcon(ImageIcon.java:413)
at Game.Board.<init>(Board.java:264)
at Game.MainMenu$1.actionPerformed(MainMenu.java:81)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6516)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6281)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4872)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4698)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:740)
at java.awt.EventQueue.access$300(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:699)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:713)
at java.awt.EventQueue$4.run(EventQueue.java:711)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:710)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
线程“AWT-EventQueue-0”java.lang.NullPointerException中的异常
位于javax.swing.ImageIcon.paintIcon(ImageIcon.java:413)
在Game.Board.(Board.java:264)
在Game.MainMenu$1.actionPerformed(MainMenu.java:81)
在javax.swing.AbstractButton.fireActionPerformed上(AbstractButton.java:2018)
位于javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
在javax.swing.DefaultButtonModel.fireActionPerformed上(DefaultButtonModel.java:402)
在javax.swing.DefaultButtonModel.setPressed中(DefaultButtonModel.java:259)
在javax.swing.plaf.basic.BasicButtonListener.MouseRelease(BasicButtonListener.java:252)
位于java.awt.Component.ProcessMouseeEvent(Component.java:6516)
位于javax.swing.JComponent.ProcessMouseeEvent(JComponent.java:3321)
位于java.awt.Component.processEvent(Component.java:6281)
位于java.awt.Container.processEvent(Container.java:2229)
位于java.awt.Component.dispatchEventImpl(Component.java:4872)
位于java.awt.Container.dispatchEventImpl(Container.java:2287)
位于java.awt.Component.dispatchEvent(Component.java:4698)
位于java.awt.LightweightDispatcher.RetargetMouseeEvent(Container.java:4832)
位于java.awt.LightweightDispatcher.ProcessMouseeEvent(Container.java:4492)
位于java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
位于java.awt.Container.dispatchEventImpl(Container.java:2273)
位于java.awt.Window.dispatchEventImpl(Window.java:2719)
位于java.awt.Component.dispatchEvent(Component.java:4698)
位于java.awt.EventQueue.dispatchEventImpl(EventQueue.java:740)
在java.awt.EventQueue.access$300(EventQueue.java:103)
位于java.awt.EventQueue$3.run(EventQueue.java:699)
位于java.awt.EventQueue$3.run(EventQueue.java:697)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
在java.awt.EventQueue$4.run(EventQueue.java:713)
在java.awt.EventQueue$4.run(EventQueue.java:711)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:710)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
在java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:161)
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy(EventDispatchThread.java:150)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
在java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
该行有几个方法调用,可能导致NPE。尝试使用临时变量将它们分散在几行上,这样会更容易发现实际的错误。尝试
“/assets/img/redBullet.png”
。与Board类的包无关。还要注意,路径是区分大小写的(在jar内或Linux上)。检查jar(=zuip文件(包含该路径。堆栈跟踪会很好。我将行拆分,但它没有得到我的getGraphics().toString(),但可能是我!我尝试将其更改为“/assets/img/redBullet.png”无效!