Why is a subclass' static initializer not invoked when a static method declared in its superclass is invoked on the subclass?

Question

Given the following classes:

public abstract class Super {
    protected static Object staticVar;

    protected static void staticMethod() {
        System.out.p         


        

Answer 1

for some reason jvm think that static block is no good, and its not executed

I believe, it is because you are not using any methods for subclass, so jvm sees no reason to "init" the class itself, the method call is statically bound to parent at compile time - there is late binding for static methods

http://ideone.com/pUyVj4

static {
    System.out.println("init");
    staticVar = new Object();
}

Add some other method, and call it before the sub

Sub.someOtherMethod();
new UsersClass().method();

or do explicit Class.forName("Sub");

Class.forName("Sub");
new UsersClass().method();