Finally I understood sticky bit concept and I want to share this with all..

Best way to learn it is we shall try an example. We all might be aware of its definitions and theory:

RESTRICTED DELETION FLAG OR STICKY BIT(t)
 

• The restricted deletion flag or sticky bit is a single bit, whose interpretation depends  on  the  file  type.  
• For directories,  it  prevents  unprivileged users from removing or renaming a file in the directory unless they own the file or the directory; this is called the restricted deletion flag for the  directory,  and  is  commonly  found  on world-writable  directories  like  /tmp.  
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