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In a typical State pattern implementation, how should the state interface method be declared to allow state transitions?

easy🧠 Conceptual Q3 of 15
LLD - Behavioral Design Patterns — Part 1
In a typical State pattern implementation, how should the state interface method be declared to allow state transitions?
Avoid handle();
Bvoid handle(Context context);
CContext handle(State state);
Dvoid handle(State state, Context context);
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of the state interface method

    The method should allow the state to perform actions and possibly change the context's state.

  2. Step 2: Analyze method signatures

    Only the method with signature void handle(Context context); allows the state to access and modify the context.

  3. Final Answer:

    void handle(Context context); -> Option B

  4. Quick Check:

    Method must accept Context to enable state transitions [OK]
Quick Trick: State methods need Context parameter for transitions [OK]
Common Mistakes:
MISTAKES
  • Defining handle() without parameters
  • Passing State as parameter instead of Context
  • Returning Context from handle method

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