"Loop detected: type b cannot propagate / implement itself or one of its own member types" error

Question

The following example below has two interfaces a and b:

interface a { void x();}
interface b extends a {void y();}

Now I implement the above interfaces as classes i and j.

class i implements a{
    void x(){
        //Some code;
    }
}

class j extends i implements b{
    void y(){
        //Some code;
    }
}

When compiling class j, I get the error "Detected loop: type b cannot extend / implement itself or one of its own member types." Can someone please help me understand the problem.

Answer 1

It seems to me that the error is caused by the declaration of the class "j", extending "i", as well as implementing "b", which are children of the "a" interface.

: "j extends i" "j" "a" ; "j b" "a" "b" , b "a". .