You want different classes like Car and Airplane to have a startEngine() method, but their implementations differ. How does using an interface help?

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PHP - Interfaces and Traits

You want different classes like Car and Airplane to have a startEngine() method, but their implementations differ. How does using an interface help?

AIt prevents Car and Airplane from having startEngine() methods

BIt shares the same startEngine() code between Car and Airplane automatically

CIt forces both classes to have a startEngine() method, ensuring they can be used interchangeably

DIt makes startEngine() method optional in both classes

Step-by-Step Solution

Solution:

Step 1: Understand interface role in method enforcement
An interface declares startEngine() method that classes must implement, but each class writes its own code.
Step 2: Recognize benefit for interchangeable use
Because both classes have startEngine(), code using them can call this method without knowing class details.
Final Answer:
It forces both classes to have a startEngine() method, ensuring they can be used interchangeably -> Option C
Quick Check:
Interface = method contract, different code [OK]

Quick Trick: Interface ensures method presence, not shared code [OK]

Common Mistakes:

Thinking interface shares method code
Believing methods become optional
Confusing interface with inheritance

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You want different classes like Car and Airplane to have a startEngine() method, but their implementations differ. How does using an interface help?

Step 1: Understand interface role in method enforcement

Step 2: Recognize benefit for interchangeable use

Final Answer:

Quick Check:

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