java - Editing properties files w/o losing formatting -

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i have properties (java world) file comments , key=value. want take backup of file , edit few key=value. need edit key in loop number of keys not fixed , key names differ partly not problem, struggling know how maintain format of file (comments, spaces)?

 # abc system admin database        abc_jdbc.password=5667p7jil7k221j+dmnvq==   # xyz system admin database        xyz_jdbc.password=489slp7jil7k221j+lmnvq==

and on......

properties jdk not remember previous state. can use other library it, example commons configuration


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