Unboxing issues

Question

I have a class that extends the LinkedList class. Here\'s an excerpt of the code:

class SortedList extends LinkedList {
      i         


        

Answer 1

This is because you have after SortedList.

Usually you use T for type parameters: class SortedList, but you used Integer instead. That is, you made Integer a type parameter (which shadows the java.lang.Integer).

Your class, as it stands, is equivalent to

class SortedList extends LinkedList {
      int intMethod(T integerObject){
          return integerObject;         // <--  "Cannot convert from T to int"
      }
}

Remove the type parameter and it works just fine:

class SortedList extends LinkedList {
      int intMethod(Integer integerObject){
          return integerObject;
      }
}