Nested FOR loops

Hello everyone!

This is my first post here,so excuse me if i write something wrong.

I was looking at this tpic,and i havent found question like mine.

Im absolute beginner in java,but i need to write a class,that will give me output like this:

*

***

****

***

*

I have to use for loop,i know that i have to use nested for loops,for rows and columns. I just cant figure it out the thing with spaces,and how to turn it to count back.

Hope you guys understand what i want. Thank you all! Greetings and happy holidays!