Initialize value of variable while declaration

Question

Can somebody explain me why below program produce 10 and 0 ?. I would expected 10 and 10;

public final class Testing {
    static int j = function1();
    static int i = 10;

    public static void main(String[] args) {
    System.out.println(i);
    System.out.println(j);
    }

    public static int function1() {
    return i;
    }

}

Answer 1

static variables are initialized in the order they appear in the source code of the class. Therefore when j is initialized, i is still 0 by default, so function1 returns 0 and j is initialized to 0.

After j is initialized to 0, i is initialized to 10, and your main prints 10 and 0.

JLS 12.4.2 :

Next, execute either the class variable initializers and static initializers of the class, or the field initializers of the interface, in textual order, as though they were a single block.