Enthuware

icepeanuts wrote:To be frank, I don't fully understand the explanation given. I already knew it should print out QBANK, but not sure if the static block defined in Sub class is executed when the main method is using Sub.ID. According to the answer, it isn't executed actually. So I guess that static block in Sub is only executed when a Sub object is being instantiated, right?

admin wrote:(...)
Inheritance does not apply to static members.
HTH,
Paul.

admin wrote:http://stackoverflow.com/questions/1740 ... ic-in-java

admin wrote:I don;t see how your code can print "In SubQuerulant". I see only "In Sub" in your code. Please paste exact code that you are using.

interface I {
    int i = 1, ii = Test.out("ii", 2);
}
interface J extends I {
    int j = Test.out("j", 3), jj = Test.out("jj", 4);
}
interface K extends J {
    int k = Test.out("k", 5);
}
class Test {
    public static void main(String[] args) {
        System.out.println(J.i);
        System.out.println(K.j);
    }
    static int out(String s, int i) {
        System.out.println(s + "=" + i);
        return i;
    }
}
This program produces the output:

1
j=3
jj=4
3

ii=2

jj = 4

The reference to J.i is to a field that is a constant variable (§4.12.4); therefore, it does not cause I to be initialized (§13.4.9).

A class or interface type T will be initialized immediately before the first occurrence of any one of the following:
...
-A static field declared by T is used and the field is not a constant variable (§4.12.4).
...

System.out.println(Sub.ID);