giri,
Where were these files? Were they in an output (classes) folder by any chance? We’ll really need more information about what exactly you did in order to help, but you might try right-clicking on the project and selecting ‘Restore from Local History…’ to see if Eclipse remembers the file locations.
If that doesn’t work, can you please post all the information we request in the [URL=http://www.myeclipseide.com/PNphpBB2+file-viewtopic-t-393.html]Posting Guidelines[/URL] thread at the top of this forum? That will give us some context so that we can determine if this is an installation issue, a configuration problem, or a bug. Thanks.