suresh In Object-Oriented Programming (OOP), the main difference between an abstract class and an interface lies in their implementation and functionality.
An abstract class in OOP is a class that cannot be instantiated on its own and may contain a mix of concrete and abstract methods. Subclasses that inherit from an abstract class need to provide implementations for its abstract methods. On the other hand, an interface in OOP is a blueprint of methods that a class must implement, but it cannot contain any implementation details. A class can implement multiple interfaces but can only inherit from one abstract class.
In conclusion, the key difference between abstract class and interface in OOP is that while an abstract class can contain a mix of concrete and abstract methods and can have instance variables, an interface only contains abstract methods and constants. Each has its own use cases and benefits depending on the design requirements of the software.
Focus keyword: abstract class and interface in OOP
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