using Math as a class name in Java is poor practice, since it conflicts with the standard library class java.lang.math. It could be renamed, possibly with backwards compatibility through reflection.

This is due to the use of raw types in the reference solution:

... = new LinkedList();

proposed fix here (author gone)

Also:

• upgrade to JUnit 5
• made the initial code compile
• the tests suite no longer logs to stdout
• added assertion messages to the random tests

Tests generate warnings:

Note: src/test/java/TestInterval.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

To expand on this, any non zero value returns true, any zero returns false. This means you never need to check if something == 0 in your if statements, you can infer that if it is zero it will return false, and structure the program around that.

I believe this solution works due to incomplete test cases. Like [0,1,2,2,4] will return a true when it should not.

C# translation ready! Please review and approve.

Welp, that's too bad. And the author is active too so let's leave it to him. Anyway, you can approve my other translations (or my kata) XD

Dunno it's a mess there's used to be Crystal and JS but author deleted the languages so I'm refrained from approving your JS XDD

To be fair, he did check. He forked some of them. In fact, one of the translation is his own.

JavaScript translation kumited :). Feel free to check

Wait, I'm confused. What's the original language of this kata? There are Python, Java, Ruby, and CoffeSript translations, but these are also the only available languages. You can't translate it to the same language, right?

should be fixed

should be fixed