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Thread: How to create a sorted set from the contents of an array

  1. #1
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    Default How to create a sorted set from the contents of an array

    Hello people,

    I need to write a public class method that has an array of integers as its argument and returns a sorted
    set containing all of the elements of that array.
    Im really stuck on this but my best attempt is as follows but this returns errors already when i Try to compile.
     
      public SortedSet arrayToSortedSet(Integer[] anArray)
      {
         Set<Integer>aSet =new TreeSet<Integer>();
         aSet.add(anArray);
         return aSet;
       }

    Sorry this is such a noob question but I just cant work out how to do it.
    Last edited by davie; March 11th, 2010 at 02:45 PM.


  2. #2
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    Default Re: How to create a sorted set from the contents of an array

    Well, this works, although there may be a more elegant solution.

    Array is not a Collection, so you cannot use TreeSet's "addAll" or constructor to include elements. Sorry... you'll have to loop the good old-fashioned way, adding one element at a time.

    Next, aSet must be declared to be of type SortedSet or TreeSet. Set won't work because you need to return a SortedSet
    and SortedSet is a subclass of Set. So yeah, the following code should work...

           public SortedSet arrayToSortedSet(Integer[] anArray)
          {
             SortedSet<Integer>aSet = new TreeSet<Integer>();
     
             for(int i = 0; i < anArray.length; i++)
                aSet.add(anArray[i]);
     
             return aSet;
          }

    A perhaps more elegant solution is to find some type of collection that will allow you to convert arrays, and then use that collection with the treeset. Personally, I think this is alright.
    Let me know what you think of my website:
    http://www.auburn.edu/~carpept
    Comments or suggestions are appreciated!

  3. The Following User Says Thank You to CT&SC For This Useful Post:

    davie (March 11th, 2010)

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