Question

What is java’s equivalent of ManualResetEvent?

Answer 1

The closest I know of is the Semaphore. Just use it with a "permit" count of 1, and acquire/release will be pretty much the same as what you know from the ManualResetEvent.

A semaphore initialized to one, and
which is used such that it only has at
most one permit available, can serve
as a mutual exclusion lock. This is
more commonly known as a binary
semaphore, because it only has two
states: one permit available, or zero
permits available. When used in this
way, the binary semaphore has the
property (unlike many Lock
implementations), that the "lock" can
be released by a thread other than the
owner (as semaphores have no notion of
ownership). This can be useful in some
specialized contexts, such as deadlock
recovery.