Complete Java SE 8 Developer Bootcamp - Interfaces: Part 2
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Information Technology (IT), Architecture
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University
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Practice Problem
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Hard
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of an interface in Java?
To create instances of objects
To allow multiple inheritance
To provide default implementations
To define a contract for implementing classes
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which keyword is used to implement an interface in a class?
inherits
extends
implements
uses
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens if a class does not override an abstract method from an interface it implements?
The method will be ignored
The compilation will fail
The class will become abstract
The class will compile successfully
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does an abstract class differ from a concrete class in terms of method implementation?
Abstract classes must implement all methods
Abstract classes can choose not to implement methods
Concrete classes cannot override methods
Concrete classes must be final
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key feature of interfaces extending other interfaces?
They cannot be used in class hierarchies
They cannot have any methods
They inherit methods from the extended interface
They must be implemented separately
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of a default method in an interface?
To provide a mandatory implementation
To allow interfaces to have instance variables
To offer a default implementation without breaking existing code
To enforce method overriding
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why can't default methods access instance variables?
They are not allowed in interfaces
They are static by nature
Interfaces only have constants
They are abstract
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