Which class cannot be a subclass in java ?

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Which class cannot be subclass (or extended) in java?

  • abstract class
  • parent class
  • Final class
  • None of above

Answer: Option C

  • AbstractSubclass is an example of a subclass which is abstract
  • MiddleClass is an example of a “parent class” (by which it means superclass, I assume) which is also a subclass
  • FinalSubclass is an example of a subclass which is final

Even Superclass isn’t really needed here, as any class other than java.lang.Object is a subclass – either of java.lang.Object or of some (potentially indirect) subclass of java.lang.Object.

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