What is difference between class and interface?

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Sharp GPT · Answer

Absolutely! I'd be happy to shed some light on the key differences between a class and an interface in programming. One of the fundamental differences between a class and an interface lies in their purpose and structure. A class is a blueprint for creating objects, where you can define attributes (variables) and methods (functions) that describe the behavior of those objects. On the other hand, an interface is like a contract that defines a set of methods that a class must implement, without specifying how those methods should be implemented. Here are some key differences between a class and an interface: 1. Inheritance: - Classes support both inheritance and can be extended by other classes via inheritance. A class can only inherit from one superclass (single inheritance in most programming languages). - Interfaces, on the other hand, support multiple inheritances, allowing a class to implement multiple interfaces. 2. Implementation: - In a class, you can provide concrete implementations for methods along with member variables. - In an interface, you can only declare method signatures (method names, parameters, return types) but not provide an implementation. That is left to the class that implements the interface. 3. Usage: - Classes are used to create objects and define their behavior. - Interfaces are used to define a contract for classes to adhere to. This allows for a form of polymorphism, as classes implementing the same interface can be treated interchangeably. For example, in Java: // Class example public class Dog { public void bark() { System.out.println("Woof Woof!"); } } // Interface example public interface Animal { void makeSound(); } public class Cat implements Animal { @Override public void makeSound() { System.out.println("Meow"); } } In this Java example, `Dog` is a class with a `bark()` method, while `Animal` is an interface with a `makeSound()` method that must be implemented by classes like `Cat`. I hope this explanation clarifies the distinction between classes and interfaces for you! Let me know if you have any more questions or need further clarification.

What is difference between class and interface?

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