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what is being Thread Safe ??????

 
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Hi,
I am a bit confused over what is being Thread Safe.
Suppose I have a multi threaded program accessing a Hashtable, when thread A is accessing the hashtable, thread B can also access it and corrupt the data. Is this what is called not being Thread Safe ??
If I make the hashtable synchronized, that makes it Thread Safe, am I right ??
Thanks in advance.
Sim Sim.
 
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Yes, but strictly speaking only methods and blocks can be synchronized. Sun has a link on synchronizing threads. Another good link is artima.com.
 
Consider Paul's rocket mass heater.
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