Multiset in Java

You only need one single file: https://github.com/claudemartin/multiset/blob/master/Multiset/src/ch/claude_martin/Multiset.java

Update 2024/04/26: I gave this a bit of a rework. It's mostly the same, but I did remove some outdated parts of the code. You can still just copy Multiset.java and the test if you want to use it. I won't bother creating a module.

My Blog: https://humanoidreadable.wordpress.com/2015/02/20/multiset-in-java/