Difference [multithreading] synchronized with the Lock

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synchronized

1. Keywords, based jvm
2. Locks are released: @ 1: to acquire a lock thread executes the code block @ 2 over thread execution appear abnormal, is a passive way to release, () released by Monitor.exit, Monitor more explanation see:. HTTPS: // Blog. csdn.net/ignorewho/article/details/80854625
3. It is a reentrant lock, interruptible lock,
4. Suitable for less concurrency

Lock

1. Interface, based on java programming
2. Call Lock.unlock () to release the lock, is an active way to release
3. Divided into: ReentrantLock read-write locks, ReadWriteLock reentrant lock, lock fair, interruptible lock
4. Higher than the synchronized performance at high concurrency