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

I know the original questions asks for solutions in Java 5, but in case someone else searching for an answer to this question is not limited to Java 5 here is a Java 8 approach.

return aMap.values().stream().distinct().limit(2).count() < 2