I don't understand how this concatenation works, mind explaining please?

Answer 1

Strings can be joined using the + in a process called concatenation.

https://www.sololearn.com/learn/JavaScript/1134/?ref=app

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2427/?ref=app

Answer 2

The operation is the same for all programming languages, what changes is the statement.

This is for java

https://www.sololearn.com/learn/Java/2142/?ref=app

Answer 3

that's for Java script

Answer 4

I want for Java