How to Write pos(part of speech) tagging algorithm?

hi to all...!
i want to do a mini project but i have no idea about pos tagging algorithm. so pls give me some ideas or any other existing package in Java ...!

That's not at all how this works. We have no idea what you're talking about, so you're making it impossible to help you. What is the "pos tagging algorithm"? What do you mean by "any other existing package in Java"? What have you tried? Where are you stuck?

Please read the link in my signature on asking questions the smart way before you post again.

There is a great Natural Language Package and Part Of Speech tagger for Python Natural Language Toolkit. Are you intent on using Java? If so, you may need to develop your own solution for part of speech tagging.

Check wikipedia List of natural language processing toolkits - Wikipedia, the free encyclopedia for Java toolkits.