网上也有相关的提问：回答的一般是，控制指针错误，控制操作，有个空指针什么的，本人不太明白，请高手给点详细的提示。

用netbeans 6.5时，遇到一个问题，没有解决。 Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: com.wsb.pub.Item cannot be cast to java ...

If you’ve ever wanted to understand how failure is represented in source code, you’ve come to the right place. In addition to an overview of Java exceptions, this article gets you started with Java’s ...