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Google is your best friend for these types of questions. Googling and reading tutorials and API documentation is a huge part of programming.

This is the first result for googling "java importing"...

This is the first result for googling "java scanner tutorial": Scanning (The Java™ Tutorials > Essential Classes > Basic I/O)

That seems like a goofy way to get input. Why don't you use a Scanner instead?

Putting this inside a loop (such as a do-while loop) is reasonable. Just make sure you give the user a way to exit...