Thread: Instance Variables and local variables difference

I have a question about instance variables and local variables...

When you have an instance variable defined outside of every method but inside a class (say variable named "X"), and you create a local variable the same name ("X") within a certain method, will the instance variable get changed? There are two examples below.

private int X;
 
private void test(int y)
{
     int X;
 
     X = y;
}

Will the variable X will be changed within the method, but will that change the instance variable X?

private int X
 
private void test(int X)
{
     X = X + 1;
}

How about the example above? Does the local variable take precedence over the global variable in those cases?