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Join Stack Jjava to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I was asked in an interview that how many types of locks are there in java, I knew about Synchronized this or synchronized method, and Reentrant Lock.

Are there any other kind of locks I can acquire on an Object? I don't know about the job you're interviewing for, but if I asked you that question in an interview, then I would not be looking for a right answer. I'd be looking to find out whether you understand the differences between locking that's provided by the language vs. There is no job on Earth that you're types of metal cabinet locks java from doing if you don't know exactly how many different kinds of lock are in the Java language, but there are lots of jobs that you shouldn't be doing if you don't know how to talk about it.

From javadoc of Lock those are the implemented classes:. ReentrantLock :. A reentrant mutual exclusion Lock with the same basic behavior and semantics as the implicit monitor lock accessed using synchronized methods and statements, but with extended capabilities.

WriteLock :. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a types of metal cabinet locks java Team What is Teams?

Learn more. Asked 4 years, 3 months ago. Active 4 years, 3 months ago. Viewed 8k times. Improve this question. Sumit Sagar Sumit Sagar 5 5 silver badges 14 14 bronze badges. OT: I really wonder sometimes what interviewers are thinking Add a cabunet. Active Oldest Votes. Improve this answer. Solomon Slow Solomon Slow But posting question here I got my doubt clear.

As already mentioned og others there are several ways to synchronize code. As far as I know, there are basically three different synchronization features in Java: Monitor-Objects used with synchronize keyword Locks e.

ReentrantLock Semaphores Quite similar to Locks, but they provide a pool of permits which can be claimed to enter a critical section; a Semaphore with a single available Token works equivalent to a Lock. Muto Muto 1 types of metal cabinet locks java silver badge 10 10 bronze badges.

In Java there is no explicit Mutex. A mutex-like-behaviour types of metal cabinet locks java nevertheless be implemented by using any of the mentioned synchronization variants. You say a Semaphore is a kind of lock. Pf that mean a BlockingQueue also is a kind of lock? You could use a blocking queue anywhere that you would use a semaphore, but you can also use queues for other things that go beyond what semaphores can do. Likewise, you could use a semaphore anywhere that you would use a non-reentrant java.

Lock implementation, but you can also use the semaphore for other types of metal cabinet locks java that go beyond what a mere lock can do. I see your point. As I understood the initial question, it was basically asked for the ways in which a lock on a certain section can be obtained.

I would say, that also a BlockingQueue can therefore be seen as a kind of Lock. I know that Semaphor as types of metal cabinet locks java as the Queue can also ytpes other use cases than a "simple" lock can do and are not a lock as such. Nevertheless I think yes, they are also a kind of lock. WriteLock ReentrantLock : A reentrant mutual exclusion Lock with the same basic behavior tjpes semantics as the implicit monitor lock accessed using synchronized methods and statements, cabiney with extended capabilities.

I suspect the interviewer could also have taken Types Of Metal Cabinet Locks Out into account Monitors, synchronize keyword, Mutex Should mutex and semaphore should also be counted as locks? So can we consider locks as general Lock java.

LockSyncronized, and ReentrantLock implements lock? Sumitsagar Depends. If lovks interviewer specifically had Lock s like the interface in mind - then no. But human language can be deceiving. Maybe he also referred types of metal cabinet locks java other synchronization methods. In this case - yes. I honestly cannot tell because I wasn't there.

If I had been the interviewee this would definitely be a question where I would request clarification. Sumitsagar no, if he asked specifically for Lock this is the answer. If he asked for any kind of mechanism to synchronize threads you can also add: low level synchronization synchronized, wait, notify Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Getting Dev and Ops to actually work together.

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Kohree Upgrade Cabinet Cam Lock Set, 5 Pack Keyed Alike /8 Inch Cam Locks Secure File Drawer Dresser Mailbox RV Cylinder Replacement Lock Hardware, Chrome-Finish Zinc Alloy 1, price $ . there is two type of lock in java. Object level lock: this is the lock that any thread aquires over nonstatic synchronized method. Any thread can invoke the synchronized method for different object other than the object that has invoked the synchronized method. Class level lock: this is the lock that any thread aquires over static synchronized method. So can we consider locks as general Lock(www.- ), Syncronized, and ReentrantLock (implements lock)? – Sumit Sagar Dec 22 '16 at @Sumitsagar Depends.

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