Cyclic class

[Weerawit Maneepongsawat]

public interface InterfaceA {
    public static final int A = 2 * InterfaceB.B;
}
public interface InterfaceB {
    public static final int B = InterfaceC.C + 1;
}
public interface InterfaceC extends InterfaceA {
    public static final int C = A + 1;
}
public class Main implements InterfaceA, InterfaceB, InterfaceC {
    public static void main (String [] args) {
        System.out.println (C + B + A);
    } 
}

i found this code in some site.
pls explain what happen

[Lawrence Chettiar]

Well the answer is in the behaviour of Classloader/Intilization.
JLS: A class/interface is initialized when either its static variable/method is called for the first time, in the above case when the C is used in the main method the initilizer tries to initilize the C it reaches line int C= which uses interfaceA so it will try to initilize A when it reaches A= it uses B= so it initilize B it reaches B= which uses C again as C is in mid of initilization if a variable is used in mid of initilization the default value is returned its similar to using a variable of a subclass in super class constructor. Hence the the value returned for int B= 0 + 1 and rest is calcuated, but when the control comes to the main method the interfaceC is fully intilized it can now get value of C.
Hope this answered your question.