Confusion with explicit constructor invocation

In the code that I have provided the overloaded constructor with argument which makes a call to the no-args constructor, which inturn should call the constructor of the object class in this case. So how does using the this() keyword execute the program correctly but not a direct call to the constructor.

public class S {

    S() {
        System.out.println("S()");
    }

    S(int i) {

        this();
        S();// The method S is undefined for type S
        System.out.println("S(int i)");
    }

    public static void main(String[] args) {
        S obj1 = new S();
        System.out.println("----------");
        S obj2 = new S(10);
        System.out.println("----------");

    }

}