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What is the main purpose of the State pattern in system design?

easy🧠 Conceptual Q11 of Q15
LLD - Behavioral Design Patterns — Part 1
What is the main purpose of the State pattern in system design?
ATo provide a global point of access to a resource
BTo create multiple instances of a class efficiently
CTo allow an object to change its behavior when its internal state changes
DTo separate the construction of a complex object from its representation
Step-by-Step Solution
Solution:
  1. Step 1: Understand the role of the State pattern

    The State pattern helps an object change its behavior based on its internal state without changing its class.
  2. Step 2: Compare with other design patterns

    Other options describe Singleton (A), Prototype (B), and Builder (C) patterns, which are unrelated to state behavior changes.
  3. Final Answer:

    To allow an object to change its behavior when its internal state changes -> Option C
  4. Quick Check:

    State pattern = behavior change by internal state [OK]
Quick Trick: State pattern changes behavior with state, not object creation [OK]
Common Mistakes:
MISTAKES
  • Confusing State pattern with Singleton or Builder patterns
  • Thinking it manages object creation instead of behavior
  • Assuming it provides global access to resources

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