I cant able to understand this code i am getting 6 as output?

please explain this code i am getting the output as 6,anyone please help me.

class A
{
    static int i=1111;
    static
    {
        i=i-- - --i;
    }
    {
        i=i++ + ++i;
    }
}
class B extends A
{
    static
    {
        i=--i - i--;
    }
    {
        i=++i + i++; 
    }
}
public class Shadow2
{
    public static void main(String[] args)
    {
        B b=new B();

        System.out.println("Find->"+b.i);
    }
}

output Find->6 Anyone help me to go through the code