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

The problem is that you've declared Integer as a generic type parameter for the SortedList class. So when you refer to Integer as a parameter of the intMethod method, that means the type parameter, not the java.lang.Integer type which I suspect you meant. I think you want:

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

This way a SortedList is always a list of integers, which I suspect is what you were trying to achieve. If you did want to make SortedList a generic type, you would probably want:

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