Which of the following is the correct way to declare a payment strategy interface method in Java?

easy📝 Conceptual Q3 of 15

LLD - Design — Online Shopping Cart

Apublic pay(double amount);

Bvoid pay(double amount) {}

Cpublic void pay(double amount);

Dvoid pay(double amount) => {}

Step-by-Step Solution

Solution:

Step 1: Recall Java interface method syntax
Interface methods are public and abstract by default and declared without a body.
Step 2: Check each option
public void pay(double amount); correctly declares a public method without body. void pay(double amount) {} has body which is invalid in interface without default. public pay(double amount); misses return type. void pay(double amount) => {} uses invalid syntax.
Final Answer:
public void pay(double amount); -> Option C
Quick Check:
Java interface method syntax = public void pay(double amount); [OK]

Quick Trick: Interface methods have no body and are public by default [OK]

Common Mistakes:

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