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Which of the following statements about encapsulation in the Snake and Ladder game design is INCORRECT?

medium🐞 Bug Identification Q14 of Q15
OOP & Design Patterns - Design Snake and Ladder Game - LLD End-to-End
Which of the following statements about encapsulation in the Snake and Ladder game design is INCORRECT?
AThe Board class hides the details of snakes and ladders from other components, exposing only necessary methods
BEncapsulation ensures that the Player's position can only be changed through controlled methods, preventing invalid moves
CThe Dice class should expose its internal random number generator to allow external manipulation for testing
DGameController encapsulates the game rules and state transitions, preventing inconsistent game states
Step-by-Step Solution

  1. Step 1: Encapsulation of Player position

    Correct: Position changes only via controlled methods to maintain validity.

  2. Step 2: Dice class design

    Incorrect: Exposing internal RNG breaks encapsulation and risks inconsistent behavior.

  3. Step 3: Board class encapsulation

    Correct: Board hides snake/ladder details, exposing only necessary interfaces.

  4. Step 4: GameController encapsulation

    Correct: It manages rules and state transitions to keep game consistent.

  5. Final Answer:

    Option C -> Option C

  6. Quick Check:

    Only Dice exposing internal RNG violates encapsulation principles.
Quick Trick: Encapsulation means hiding internals, not exposing them for convenience [OK]
Common Mistakes:
MISTAKES
  • Thinking exposing RNG aids testing without drawbacks
  • Confusing encapsulation with just data hiding
  • Assuming all classes should expose internals for flexibility
Trap Explanation:
PITFALL
  • Candidates often justify exposing internals for testing, ignoring encapsulation risks.
Interviewer Note:
CONTEXT
  • Checks candidate's understanding of encapsulation and its correct application.
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