21.  Before doing garbage collection , _________ method is called :


main()
finalize()
final()
collect()


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22.  Which of these can be used to fully abstract a class from its implementation ?


Objects
Packages
Interfaces
None of the mentioned


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23.  A class can implements ___________ interfaces


only one
one or more than one
maximum two
minimum two


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24.  classes are useful because they


permit data to be hidden from other classes
can closely model objects in the real world
brings together all aspects of an entity in one place
all of the above


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25.  A method implementation of an interface must be declared as ____________


private
default
public
protected


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