LLD - Design — Online Shopping Cart
Which of the following is the correct way to define a payment strategy interface in a typical object-oriented language?
Which of the following is the correct way to define a payment strategy interface in a typical object-oriented language?
easy🧠 Conceptual Q12 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify the correct syntax for an interface
In object-oriented languages, interfaces declare method signatures without implementation. interface PaymentStrategy { void pay(double amount); } uses 'interface' and a method signature correctly.Step 2: Check other options
class PaymentStrategy { void pay(amount); } is a class, not an interface. Options C and D use function syntax, not interface definitions.Final Answer:
interface PaymentStrategy { void pay(double amount); } -> Option AQuick Check:
Interface syntax = interface PaymentStrategy { void pay(double amount); } [OK]
Quick Trick: Look for 'interface' keyword and method signature format [OK]
Common Mistakes:
MISTAKES- Using class instead of interface for strategy definition
- Confusing function syntax with interface
- Missing method parameter types
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