multithreading - Java volatile variable question -


I was thinking about the Java sensitization that the following code: 

  private Volatile list list; Private Finals Lock Lock = New RetreatLock (); Public Zero update (list newList) {ImmutableList L = New ImmutableList (). AddAll (newList); Lock.lock (); List = L; lock unlock(); } Public list () {return list; }

equals: 

  Personal volatile list list; Public Zero update (list newList) {ImmutableList L = New ImmutableList (). AddAll (newList); List = L; } Public list () {return list; } {/ Code>

Try {} Finally {} the block was left for brevity. I accept the ImmutableList class as a truly immutable data structure, which keeps its own data, Such as the google-collections provided in the library since the list variable is variable and basically it is happening that copy-on-the-fly, is it not safe to avoid using lock only?

In this very specific example, I think you will not make any locking on variable reassignment .

In general, I think that you are better by using one instead of the volatile variable because memory stability effects are the same and intentions are very clear.


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