How to change the variable created in the main method through another function?

Question

Java

How to change the variable created in the main method through another function? As I understand it, you can’t just take it into the argument of another function, since this will lead to the creation of a copy of the variable in the function, and not to change the value of this one. So how do you change a variable from another function?

Answer 1

First, local variables are local and other methods cannot access them. Declare variables as class fields.
Secondly, it is quite possible to pass a reference variable to another method as a parameter, without copying.