Exceptioninthread"AWT-EventQueue-0"java.lang错误
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
at cn.edu.njpi.gjp.dao.SortDao.<init>(SortDao.java:13)
at cn.edu.njpi.gjp.services.SortService.<init>(SortService.java:9)
at cn.edu.njpi.gjp.controller.SortMngController.<init>(SortMngController.java:13)
at cn.edu.njpi.gjp.controller.MainFrameContrller.sortMng(MainFrameContrller.java:14)
at cn.edu.njpi.gjp.view.AbstractMainFrame$2.actionPerformed(AbstractMainFrame.java:82)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$javaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$javaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$javaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Unknown Source)
at java.util.Properties.load0(Unknown Source)
at java.util.Properties.load(Unknown Source)
at cn.edu.njpi.gjp.tools.JDBCUtils.<clinit>(JDBCUtils.java:26)
... 41 more
你这个错误太明显了，不知道你是不是想使用递归，使用递归的话，必须要能够收缩。
但是，你这个地方，每次进入hitTanks方法时，传入的参数都是badTanks，而且，badTanks中的内容数量没有任何的改变。
从你的代码上看，你不应该是要递归调用hitTanks方法，而应该是调用hitTan方法，下面为修改后的代码
public boolean hitTanks(List<Tank> badTanks) {
for (Iterator iterator = badTanks.iterator(); iterator.hasNext();) {
Tank badTanks1 = (Tank) iterator.next();
boolean b=hitTan(badTanks1); // 这一行进行了修改，修改为调用hitTan方法
if(b){
return true;
}
}return false;
}