
Clases abstractas e iinterfaces
Quiz
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Computers
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University
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Practice Problem
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Easy
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6 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
1. What is the purpose of using an abstract class?
1. What is the purpose of using an abstract class?
To enforce some rules on subclasses
To hide the implementation details from subclasses
All of the above
To provide a common interface for subclasses
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2. What is the difference between an abstract method and a non-abstract method in an abstract class?
2. What is the difference between an abstract method and a non-abstract method in an abstract class?
An abstract method has no body and must be overridden by subclasses, while a non-abstract method has a body and can be inherited by subclasses.
An abstract method has a body and can be inherited by subclasses, while a non-abstract method has no body and must be overridden by subclasses.
An abstract method has no body and must be declared with the final keyword, while a non-abstract method has a body and can be declared with any keyword.
An abstract method has no body and must be declared with the static keyword, while a non-abstract method has a body and can be declared with any keyword.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
3. What is the syntax for declaring an abstract class in Java?
3. What is the syntax for declaring an abstract class in Java?
class ClassName extends AnotherClass implements InterfaceName
abstract class ClassName extends AnotherClass implements InterfaceName
abstract class ClassName extends AnotherClass
class ClassName extends AnotherClass
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4. What is the purpose of using an interface in Java?
4. What is the purpose of using an interface in Java?
To provide a common interface for classes that share some functionality
To hide the implementation details from classes that use them
To enforce some rules on classes that implement them
All of the above
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
5. What is the difference between an interface and an abstract class in Java?
5. What is the difference between an interface and an abstract class in Java?
An interface can only have public methods, while an abstract class can have any access modifier for its methods
All of the above
An interface can only have abstract methods, while an abstract class can have both abstract and non-abstract methods
An interface can only extend one other interface, while an abstract class can extend multiple classes or interfaces
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
6. What is the syntax for declaring an interface in Java?
6. What is the syntax for declaring an interface in Java?
interface InterfaceName { ... }
abstract class InterfaceName { ... }
class InterfaceName implements InterfaceName { ... }
interface InterfaceName extends AnotherInterface { ... }
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