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Quiz on Abstract Method and Class in Java

Quiz on Abstract Method and Class in Java

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Question 1 of 10

1. Question

What is an abstract class in Java?

A class with only static methods
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A class that cannot be inherited
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A class that cannot be instantiated
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A class with only private methods
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Question 2 of 10

2. Question

Which keyword is used to declare an abstract class in Java?

base
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extends
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abstract
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virtual
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Question 3 of 10

3. Question

What is an abstract method?

A method without parameters
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A method without a return type
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A method without a body
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A static method
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Question 4 of 10

4. Question

Can an abstract class have non-abstract methods?

Yes
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No
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Only in interfaces
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Only in final classes
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Question 5 of 10

5. Question

Which of the following is true about abstract methods?

They must be declared in final classes
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They must have a method body
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They are always private
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They must be overridden in the child class
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Question 6 of 10

6. Question

What happens if a class has at least one abstract method?

It must be declared abstract
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It can be used as-is
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It should be private
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It cannot have a constructor
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Question 7 of 10

7. Question

Which of the following is a correct declaration of an abstract method?

public void show() {}
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abstract void show();
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void show() = 0;
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static abstract show();
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Question 8 of 10

8. Question

Can an abstract class be final in Java?

Yes
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No
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Only with private constructors
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Only in interfaces
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Question 9 of 10

9. Question

Which of the following must a child class do if it extends an abstract class?

Declare itself as final
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Override all abstract methods
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Call the super class constructor
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Create multiple objects
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Question 10 of 10

10. Question

Why do we use abstract classes in Java?

To create object templates
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To avoid using inheritance
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To prevent code reuse
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To create concrete methods only
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