java - how to implement a variable whose value is not lost after every run? -

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i wish implement variable (in java) value either stored somewhere or not reset every time run program. it's related "booking reference number" flight program. know database connectivity make new data base 1 variable pretty pointless. ideas should/can do?
don't want numbers random want them in order if first booking id 100 next 1 should 101 , on.

organize data in structure , serialize it.when re-run program, serialized version in file system, if there any, read it. viola.!


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