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Thread: New Programmer working with generics!

  1. #1
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    Default New Programmer working with generics!

    Here is my interface:

    public interface BasicList<E>
    {
       public void add(E element);
       public E get(int index);
       public void add(int index, E element);
       public void clear();
       public boolean contains(E element);
       public int indexOf(E element);
       public E remove(E element);
       public E set(int index, E element);
       public int size(); 
    }

    Here is my class that implements it, right now I am only working on add() and get()
    public class BasicArrayList<E> implements BasicList<E>
    {
       private int size;
       private Object[] array;
       public static final int DEFAULT_CAPACITY = 10;
       public BasicArrayList()
       {
          size = 0;
          array = new Object[DEFAULT_CAPACITY];
       }
       public BasicArrayList(int capacity)
       {
          size = 0;
          array = new Object[capacity];
       }
       public void add(E element)
       {
          array[0] = element;
       }
       public E get(int index)
       {
          return array[index];
       }      
    }

    My problem I know is that I am trying to return an element and giving it an Object. However, I don't know how I would implement a get that would snatch an element out of an array. Thanks in advance!!


  2. #2
    Junior Member
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    Default Re: New Programmer working with generics!

    I'm not particularly familiar with generics, but it looks like all you need to do is change your array variable from an Object[] to an E[]. Then initialize the array as a new E[Default_Capacity].

    I hope that helps. There is more information regarding generics here.

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