Unable To Differentiate Legal And Illegal Forward Reference

I understand that the following is an example of valid reference in java. I also understand that at class creation, first i and j are initialized to 0. j is then re-initialized to 5, as a result of which i's value is 0 and j's is 5 inside main.

class J
{
static int test() {
return j;
}
static int i = test();
 
[Code] ....

But why is the same not true for the following ? Why is it that i and j are not initialized to the default value of 0 in this case and gives an illegal forward reference?

class test
{
static int i = j;
static int j=5;
  public static void main(String[] args) {
System.out.println(i);
System.out.println(j);
}
}

Why is it legal forward reference when using a method, and illegal when pretty much the same thing is done using a variable ?