How long does Timer.schedule schedule for when delay is 0?

Question

In Timer.schedule(TimerTask task, long delay), it says it will throw if delay is negative, but doesn't say anything about if delay is zero. What will happen? I tried on openjdk and it ran instantly. Is this behavior specified somewhere else, or is it undefined (e.g it means infinite on other implementations, or some implementations will do infinite sometimes and instant sometimes)?

Answer 1

I believe a Timer in java is a Thread with a task queue. Items are ordered in the task queue by when they are supposed to fire. Tasks with a delay of 0 are supposed to fire immediately and thus go to top of queue. I believe the behavior you are seeing is expected and should be consistent cross platform and across different jdks