Classes: Inheritance (cont.)

• Can override method, attribute definitions in a subclass

  • Type of redefined attribute must be subtype of inherited attribute’s type
  • All types in a redefined method signature must be subtypes of corresponding types in inherited method

• Problem:

• • Which fire_emp method is invoked on a nextDept?
  • Unknown until run-time: late binding

for (nextDept in Departments)

nextDept->fire_emp;

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