Inheritence -Java Programming MCQ Questions and Answers

1

What is inheritance in Java?

A) The process of acquiring properties and behaviors of one class by another B) The process of creating objects C) The process of encapsulation D) The process of overloading methods

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Answer & Solution

Answer: Option A

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2

In Java, which keyword is used to implement inheritance between classes?

A) inheritsFrom B) inherits C) implements D) extends

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Answer & Solution

Answer: Option D

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3

What is a superclass in Java?

A) The class that inherits properties and behaviors B) The child class C) The class that is inherited from D) The class that is marked as "final"

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Answer & Solution

Answer: Option C

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4

In Java, can a subclass inherit constructors from its superclass?

A) Only if the subclass is marked as "final" B) Yes, a subclass inherits constructors from its superclass C) Only if the superclass is marked as "static" D) None of the above

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Answer & Solution

Answer: Option D

Solution:

Option A: Only if the subclass is marked as "final"

This option is incorrect. Marking a subclass as "final" means that it cannot be subclassed further, and it has no impact on the inheritance of constructors.

Option B: Yes, a subclass inherits constructors from its superclass

This option is incorrect. In Java, a subclass does not inherit constructors from its superclass. However, a subclass can call the constructors of its superclass using the super keyword.

Option C: Only if the superclass is marked as "static"

This option is incorrect. The "static" keyword cannot be applied to classes or constructors in a way that would affect inheritance.

Option D: None of the above

This option is correct. In Java, constructors are not inherited by subclasses. Subclasses must explicitly define their own constructors, although they can call their superclass's constructors using the super keyword.

Conclusion:

In Java, a subclass does not inherit constructors from its superclass, making Option D: None of the above the correct answer.

5

What is method overriding in Java?

A) Making a method static B) Hiding a superclass method C) Redefining a superclass method in a subclass to provide a specific implementation D) Creating a new method with the same name in a subclass

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Answer & Solution

Answer: Option C

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6

In Java, can a subclass override a private method from its superclass?

A) Yes, as long as it's in the same package B) Yes, regardless of the access modifier C) No, private methods cannot be overridden D) No, private methods are not visible to subclasses

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Answer & Solution

Answer: Option D

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7

What is the "super" keyword used for in Java?

A) To call a method or constructor of the superclass B) To create a new instance of a class C) To hide a superclass method D) To make a method final

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Answer & Solution

Answer: Option A

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8

What is the result of the following code snippet?

class Parent {
    void display() {
        System.out.println("Parent");
    }
}
class Child extends Parent {
    void display() {
        System.out.println("Child");
    }
}
public class Main {
    public static void main(String[] args) {
        Parent obj = new Child();
        obj.display();
    }
}

A) Runtime exception B) Compilation error C) Parent D) Child

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Answer & Solution

Answer: Option D

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9

In Java, can a subclass access private members (fields and methods) of its superclass?

A) Yes, as long as the subclass is in the same package B) Yes, regardless of the access modifier C) No, private members are not visible to subclasses D) Only if the superclass is marked as "final"

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Answer & Solution

Answer: Option C

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10

What is the difference between "extends" and "implements" in Java?

A) Both are used for class inheritance B) "Extends" is used for class inheritance, while "implements" is used for interface implementation C) Both are used for interface implementation D) None of These

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Answer & Solution

Answer: Option B

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