报错信息如下:
Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problems:
framelookbook cannot be resolved to a type
frameaddborrower cannot be resolved to a type
framehelpborrower cannot be resolved to a type
framesurfinformation cannot be resolved to a type
其中framelookbook,frameaddborrower等都是继承了JFrame窗口的类
如class framelookbook extends JFrame implements ActionListener
且他们都在同一个包下的同一个java文件里