explain this code please.

Question

why is the output 5? and not 6. Could someone please explain using the most simple terms possible.

public class MyClass {
public static void main(String[ ] args) {
int x = 5;
addOneTo(x);
System.out.println(x);
}
static void addOneTo(int num) {
num = num + 1;
}
}
// Outputs "5"

Answer 1

here, passing x doesn't actually pass x. instead, it makes a copy of x and passes it. hence, anychanges to the copy wouldn't affect x.

Answer 2

That was a brilliant reply, thank you!

Answer 3

I think answer is 5 because, in this example value of x is refers to the function and as this function get the value of x set it to num then increase num, and code prints the value of x not num. so this code's output is 5.