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thread safe
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Blanka Li
Greenhorn
Joined: Feb 18, 2002
Posts: 13
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"Vector and HashTable are the only classes that are thread-safe".
what is the meaning of "thread-safe" here? And why the two class are thread-safe?
thanks!
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Jose Botella
Ranch Hand
Joined: Jul 03, 2001
Posts: 2120
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Hello Blanka, wellcome to the Ranch 
Thread safe means that it is safe for several threads call the methods of an object, because they are not going to be executed simultaneously. Imagine wanting to add an element at the same time an iterator is returned, or deleting other.
Because the code in the methods of Vector and HashTable are synchonized. One thread would have to wait before entering a method that is "protected" (synchronized on) by the same lock that has been adquired by another thread.
Read more on the Java Tutorial , and this Thinking in Java's chapter
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SCJP2. Please Indent your code using UBB Code
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Blanka Li
Greenhorn
Joined: Feb 18, 2002
Posts: 13
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Jose Botella, thank you very very much! 
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subject: thread safe
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