Question

The same as this question but for java

Update Based on the comments and responses of a few people, Its clear that Java has very little undefined behaviour.

So I’d like to ask as well what behaviour is not obvious. Please when answering make the distinction between the two 🙂

Answer 1

Anything to do with threads… 🙂

Also:

• Overriding methods and expecting them to be used in the same way between versions
• Assumptions about underlying platform (file separator, for instance)
• Details of garbage collection/finalisation
• Some details about class initialisation
• Whether Integer.valueOf (and the like) return the same objects
• Performance, latency and memory usage