use the command pattern was a simple java programs to achieve cd and ls two orders

Packet : 684720commandpattern-filesystem.rar filelist
FileSystem
FileSystem\help.java
FileSystem\cd.class
FileSystem\Command.class
FileSystem\CommandException.class
FileSystem\exit.class
FileSystem\FileSystemShell.class
FileSystem\help.class
FileSystem\cd.java
FileSystem\ls.class
FileSystem\FileSystemShell.java
FileSystem\CommandException.java
FileSystem\Command.java
FileSystem\ls.java
FileSystem\build.bat
FileSystem\run.bat
FileSystem\exit.java

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