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Answer Posted / nidhi
finalize is the method called(if defined) by garbage
collector just before it calls any object for garbage
collection. You are never sure that when will it be called.
The main aim for defining this method is to release the
resources that the object is holding before the object
could be deleted from the memory. If this method is called
then the object is not deleted from the memory in that
particular run of garbage collection but is deleted in the
next run.
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Say you want to store the information about a number of pets in an array. Typical information that you could store for each pet (where relevant) would be • Breed of animal • Animal's name • Its birth date • Its sex • Whether it has been sterilised or not • When it is due for its next inoculation • When it last had its wings clipped For each type of pet (eg. dog, cat or bird) you would typically define a class to hold the relevant data. Note: You do not need to implement these classes. Just answer the following questions. 3.1.1 What would be the advantage of creating a superclass (eg. Pet) and declaring an array of Pet objects over simply using an array of Objects, storing each of the instances of the different pet classes (eg. Dog, Cat or Bird) in it? 3.1.2 Would you define Pet as a class or as an interface? Why? (2) (2)
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