Monday, November 25, 2013

Java 5 introduce the lock method. Any pros and cons using lock compared to synchronized keyword?
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2 Answers

'synchronize' will lock any resources accessed within the method. 'lock' allows you more granularity, and control (e.g. only locking some resources, or locking only if a certain condition is met, for example).
There's a pretty good code sample near the top of this link:http://download.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/locks/Lock.html
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The java.util.concurrent locks give you more control on what and when to lock. You can still use the synchronized keyword if it fits your needs (e.g. if you need per-instance / per-class synchronization)
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