principles of prograaming language java tar file needed

I'm looking for someone to help me with a programming language Java project. The purpose of the project is to solve a question, though I'm not sure which version of Java should be used. The type of file I need is a tar file. Therefore, I'm looking for an experienced programmer who can use Java to generate a tar file to provide a solution to this project. Please let me know if you are able to help with this. Thanks!