Updation in zip file through java program

Hi,
Can any buddy help me updating zip file using java programs. I dont want to delete the zip file but I want to update single file in the zip.
Any clue ?
Regards,
Ashish

I mean I want to update a zip file using java program.
Suppose there are 4 files zipped into single zip file.
zipped.zip contains a.txt, b.txt. c.txt. d.txt
Now the contect of a.txt got changed and I want to update zipped.zip to with the changed a.txt.
I have one way of creating a new file with new set of a.txt, b.txt, c.txt and then delete the earliar zipped.zip and rename the newly created zipped to zipped.zip.
I dont want to do the same as above mentioned way. Is there any way provided in java API to remove any entry or update any entry?
I feel now the problem has got explained in details.
Any help ?

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              String   PONO="";
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