Originally Posted by macteki

It worked because showInputDialog() is expecting String array instead of Object array. If you passed an object array into it, the default "toString()" method would be called, which is implementation dependent.



There are two method declaration for toArray() in java.util.Set

1. Object[] toArray()
Returns an array containing all of the elements in this set.

2. <T> T[] toArray(T[] a)
Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.

See this link for reference.

http://docs.oracle.com/javase/6/docs.../util/Set.html