UGC NET Computer Science July 2018 - II | Question 6

Question 6

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6. In Java, which of the following statements is/are True ?
S₁ : The ‘final’ keyword applied to a class definition prevents the class from being extended through derivation.
S₂ : A class can only inherit one class but can implement multiple interfaces.
S₃ : Java permits a class to replace the implementation of a method that it has inherited. It is called method overloading.

Code :

1. (1) S₁ and S₂ only
2. (2) S₁ and S₃ only
3. (3) S₂ and S₃ only
4. (4) All of S₁, S₂ and S₃

Answer : (1) S₁ and S₂ only

Explanation Question 6

• Statement S₁ is True → Final classes Prevent inheritance. So, final classes cannot be extended or inherited in java.
• Statement S₂ is True → A class can only inherit/extend one class but can implement multiple interfaces.
• Statement S₃ is False → Java permits a class to replace the implementation of a method that it has inherited. It is called method overriding.

Statements S₁ and S₂ are True statements

So, Option (1) is correct answer.

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UGC-NET CS 2018 July - II Question 5	UGC NET CS 2018 July - II Question 7