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Implementer MobileUsage-klassen iht. kravene over.
JExercise-testkode for denne oppgaven finner du her: encapsulation/MobileUsageTest.java. jextest-koden for testen finner du her: encapsulation/MobileUsage.jextest
Del 2 - Java-kode
Implementer MobileSubscription-klassen iht. kravene over.
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