Why there are two “a”s

Question

public class Program
{
static int method(int a){
return ++a;
}

public static void main(String[] args) {
int b=3;
int a=4;
System.out.println(method(a));

}
}

Answer 1

Well, now it is clearer 👍

Yes, they are different.

static int method(int a)
* Here <a> is a function parameter.

public static void main(String[] args)
int a = 4;
* Here <a> is a local variable.

Now I understand why you got confused, I also make similar mistake at times. Using same name for parameter and argument can be confusing especially when our mind isn't so clear. Use of meaningful variable names helps for this types of problem.

Answer 2

Can you be more specific here? there are loads of letter 'a' in that code. I'm not getting what you mean here.

Answer 3

The a in the main method is outside the scope of the a in the other method. They can't see each other. Java is a pass by value, so when the a from main is passed to method during the method call, a copy of its value is passed to the a inside method.

Answer 4

i don't understand why there are two “a”s are defined with int . Are they different?