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Qs about object lock

 
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Could anyone advise the relation between object lock & number of synchronized method ?
eg : If I have 3 synchronized methed inside the same class definition, Do i got 3 locks or one shared by all three synchronized method blcok.
thanks
 
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you have one lock per object and one lock per class independent of the object lock.
It would not make any sense to have multiple locks for one object because the concept of the lock would loose its meaning since mutliple threads could access the internals of the same object and modify them (which is what we are trying to avoid by using locks).
Synchronized methods are reentrant though, which means that a Thread owning an object's lock may call another synchronized method of that object without having to acquire it, which makes sense otherwise the behavior would be deadlock-prone.
At any time, any thread may invoke any non-synchronized methods
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Valentin Crettaz
Sun Certified Programmer for Java 2 Platform
[This message has been edited by Valentin Crettaz (edited October 02, 2001).]
 
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