java.lang.NullPointerException

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  • GUI JFrame
    via by 843807,
  • NullPointerException
    via by Giovanni Montano,
  • NullPointerException
    via by Henry Wong,
    • java.lang.NullPointerException at Calculator.addStudent(Calculator.java:17) at Calculator.main(Calculator.java:38)
    No Bugmate found.