Inner Classes - General Questions

Which nested type is implicitly static?

A local inner class is defined:

What is the compiled class file name of class Inner inside Outer?

Can an anonymous class have a constructor?

What is the output of the following program?

public class Main {
    int x = 1;
    class Inner {
        int x = 2;
        int sum() { return x + Main.this.x; }
    }
    public static void main(String[] args) {
        System.out.println(new Main().new Inner().sum());
    }
}