How to complete the join method

Question

Can someone help me to have more ideas with the join Table method?

The code is below: https://code.sololearn.com/crnEY0XNhVgM/#java

Answer 1

I think Danijel Ivanović can help you, he has a Java Tutorial Series:
https://code.sololearn.com/WKFF4vOCr3mi/?ref=app