Processing to make 2 array in one

Guys really,

the videos are not what I want as an answer. They I know this channel but what I just want to know is

How I can two arrays in Processing to one without using concat().

This forum is really bad if someone needs help. Sorry for that.
I am middle in the exams and need help and not somebody who just says what I need to watch in the Internet.

Just say the right solution for my question or an hint how I can find the solution.

I have another exam questions where I dont know how I can find the solution.