File list (Check if you may need any files):
DBlab2
......\.classpath
......\.project
......\aa.txt
......\book.xls
......\database
......\........\DBAccess.class
......\........\DBAccess.java
......\gui
......\...\Gui$1.class
......\...\Gui$2.class
......\...\Gui.class
......\...\Gui.java
......\...\Maingui.class
......\...\Maingui.java
......\...\SingletonException.class
......\...\SingletonException.java
......\input
......\.....\Fromexcel.class
......\.....\Fromexcel.java
......\.....\FromTXT.class
......\.....\FromTXT.java
......\.....\新建文件夹
......\jxl.jar
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