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Thread: Using a Generic Insertion Sort method

  1. #1
    Junior Member
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    Mar 2010
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    Default Using a Generic Insertion Sort method

    I am having a real hard to trying to figure out how to use generics

    I have the following insertion sort method defined
      public static <T extends Comparable<? super T>> void insertionSort (T[] data)
         for (int index = 1; index < data.length; index++)
            T key = data[index];
            int position = index;
            /** Shift larger values to the right */
            while (position > 0 && data[position-1].compareTo(key) > 0)
               data[position] = data[position-1];
            data[position] = key;

    I am trying to call it in the following manner where class Card is previously defined

    private static List< Card > list; // declare List that will store Cards
    public static void main( String args[] )
          DeckOfCards cards = new DeckOfCards();
       } // end main

    However, I get the following error:
    The method insertionSort(T[]) in the type InsertionSort is not applicable for the arguments (List<Card>)

    Any help

  2. #2
    Super Moderator helloworld922's Avatar
    Join Date
    Jun 2009
    Thanked 619 Times in 561 Posts
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    Default Re: Using a Generic Insertion Sort method

    An Array T[] is not the same as a List<T>. Change your insertionSort method to take a parameter List<T>:

    public static <T extends Comparable<? super T>> void insertionSort (List<T> data)
       // you'll need to fix your insertionSort method to sort a list rather than an array

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