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Exception in thread "main" java.lang.NullPointerException错误怎么 ...

Syler_yu2011-11-24 10:56:17 下面这段程序，编译没问题，但运行时候会报错 Exception in thread "main" java.lang.NullPointerException at operation.GetFileInfo.getFileNum (GetFileInfo.java:20) at ...