How to eliminate Directories while i'm zipping files???????

I;ve used ZipCompress.java from Thinking in Java...
Here if we give in the command line D:\Test\*.* and inside say we r having 2 files and one directory...
At that time it came out with exception..If there is directory then its not working...if files only there then its working.. it should not consider dir and it should zip only the files..
Pls help me.

java.io.File
boolean isDirectory()

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