Goldman Sachs Interview Question Software Engineer / Developers
0of 0 votesWhen would you use an interface vs. abstract class?
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When would you use an interface vs. abstract class?
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Interface is used in scenarios where a class needs to implement all the functionality(methods) defined in the interface.
- Srikanth May 03, 2009eg: If you have to design a car you have to implement methods like steering(), wheels(), brake(), gearbox(). These are the essential methods when you have to design a car. So these methods has to be in an interface if you are designing a car.
Abstact class can be used when you need to implement some part of the functionalities defined.
Eg: There are some feature which may or may not be present in a car like powersteering() , Airbag(), musicSystem() these details can be present in an abstact class as non abstract methods. The abstact methods can be steering(), wheels(), brake(), gearbox(). So every class has to implement these abstract methods and can or cannot implement those non abstract methods when you extend an abstract class.