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1Z0-803 · Question #97

Which three statements are benefits of encapsulation?

The correct answer is A. allows a class implementation to change without changing t he clients B. protects confidential data from leaking out of the objects D. enables the class implementation to protect its invariants. Encapsulation offers several benefits, including the ability to change internal class implementation without affecting clients, protecting internal data from external leakage, and enabling a class to maintain its internal consistency by enforcing invariants.

Working with Methods and Encapsulation

Question

Which three statements are benefits of encapsulation?

Options

  • Aallows a class implementation to change without changing t he clients
  • Bprotects confidential data from leaking out of the objects
  • Cprevents code from causing exceptions
  • Denables the class implementation to protect its invariants
  • Epermits classes to be combined into the same package
  • Fenables multiple instances of the same class to be created safely

How the community answered

(25 responses)
  • A
    88% (22)
  • E
    4% (1)
  • F
    8% (2)

Why each option

Encapsulation offers several benefits, including the ability to change internal class implementation without affecting clients, protecting internal data from external leakage, and enabling a class to maintain its internal consistency by enforcing invariants.

Aallows a class implementation to change without changing t he clientsCorrect

Encapsulation hides the internal implementation details of a class, allowing developers to modify the internal workings without affecting external client code as long as the public interface remains consistent.

Bprotects confidential data from leaking out of the objectsCorrect

By restricting direct access to an object's internal data members and providing controlled access through public methods, encapsulation effectively protects confidential or sensitive data from unauthorized external access or accidental modification.

Cprevents code from causing exceptions

Encapsulation helps manage object state but does not inherently prevent code from causing exceptions; exceptions can still arise from various logical or runtime errors.

Denables the class implementation to protect its invariantsCorrect

Encapsulation allows a class to maintain its internal consistency by enforcing rules (invariants) on its data through controlled access methods, ensuring that the object's state always remains valid and meaningful.

Epermits classes to be combined into the same package

The ability to combine classes into the same package is a feature of modularization or packaging, not a direct benefit of encapsulation, which focuses on data and method bundling within a single class.

Fenables multiple instances of the same class to be created safely

Creating multiple instances of a class safely is a fundamental characteristic of object-oriented programming instantiation, while encapsulation ensures each instance's internal state is managed properly once created.

Concept tested: Benefits of encapsulation in OOP

Source: https://docs.oracle.com/javase/tutorial/java/concepts/encapsulation.html

Topics

#encapsulation#information hiding#data protection#maintainability

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