Questions And Answers for PowerBuilder Interviews

Question

How a 'Shared Variable' is different from a 'Instance Variable'?

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Answer

Well, the value of an instance variable in each instance is independent of other instances. Instance variables are created when the object is created and will be destroyed when the object is destroyed. On the other hand, the shared variable is shared between different instances of the variable. That means, changing the shared variable in one instance will affect other instances. The shared variable is created when the FIRST instance of the object is created and is destroyed when the application is closed. You can't refer to an object's shared variable when none of the instance is open, even though the shared variables exists in the memory.

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