cast an object to an interface in java?

Question

if we cast an object to an interface, won\'t this object be able to call its own methods? in the following example, myObj will only be able to call MyInterface meth

Answer 1

MyInterface mi = new Obj();
mi.getInterfaceMethods(); (methods in the MyInterface)

if(mi instanceof Obj) {
     mi.getObjMethods(); (methods in the Obj)
}