What is the meaning of “ReentrantLock” in Java?

Question

Reentrancy means that locks are acquired on a per-thread rather than per-invocation basis.

Since an intrinsic lock is held by a thread, doesn\'t it mean that a threa

Answer 1

it's about recurse, think about:

private lock = new ReentrantLock();
public void method() {
      lock.lock();
      method();
}

If the lock is not re-entrant able, the thread could block itself.