Check if all values in a map are equal

Question

I need to check if all values in a map are equal. I have a method to perform this task but would like to use a library or native methods. Limitations: Java 5 + Apache Common

Answer 1

As my comment above:

//think in a more proper name isAllValuesAreUnique for example
    public static boolean isUnique(Map aMap){
         if(aMap == null)
               return true; // or throw IlegalArgumentException()

         Collection c = aMap.getValues(); 
         return new HashSet<>(c).size() <= 1;
    }