[java] Why use a ReentrantLock if one can use synchronized(this)?

One thing to keep in mind is :

The name 'ReentrantLock' gives out a wrong message about other locking mechanism that they are not re-entrant. This is not true. Lock acquired via 'synchronized' is also re-entrant in Java.

Key difference is that 'synchronized' uses intrinsic lock ( one that every Object has ) while Lock API doesn't.

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Why use a ReentrantLock if one can use synchronized(this)?

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Why use a ReentrantLock if one can use synchronized(this)?