Java impose final programmatically -

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what's proper way ensure value gets set once, although time set unknown (ie: not in constructor). null check or keep track of flag , throw exception - exception should throw? it's small, localized library , prefer not create own valuealreadyassigned exception such seemingly generic case.

the method throw illegalstateexception, since it's javadocs say:

signals method has been invoked @ illegal inappropriate time.


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