In object-oriented programming

In object-oriented programming, “interface” and “class” are two important concepts, which play different roles in the process of realizing object abstraction and encapsulation.

### Class

#### 1. Definition:
Class is the basic concept of object-oriented programming. It is a user-defined data type used to describe a collection of objects with the same properties and methods.

#### 2. Features:

#### 3. Example:
class Car:
def __init__(self, brand, model):
self.brand = brand
self.model = model

def drive(self):
print(f”{self.brand} {self.model} is driving.”)

# Instantiate object
my_car = Car(“Toyota”, “Camry”)

An interface is an abstract type


that defines a set of methods or attributes but has no specific implementation. An interface defines the behavior that an object should have without caring about the internal structure of the object.

#### 2. Features:
– An interface only defines the signature japan phone number of a method without the specific logic of implementing the method.
– A class can implement one or more interfaces, and a class that implements an interface must implement all methods defined in the interface.
– An interface can be used to implement polymorphism.

#### 3. Example:
from abc import ABC, abstractmethod

class Shape(ABC):
def area(self):

def perimeter(self):

class Circle(Shape):
def __init__(self, radius):
self.radius = radius

def area(self):
return 3.14 * self.radius * self.radius

def perimeter(self):
return 2 * 3.14 * self.radius

# Class that implements the interface
circle = Circle(5)
print(“Area:”, circle.area())
print(“Perimeter:”, circle.perimeter())

Differences and connections

1. **Definition level:** A class is a specific data Armenia Phone Number List type that defines the properties and methods of an object; an interface is an abstract type that defines the behavior of an object but has no specific implementation.
2. **Implementation method:** Classes can be instantiated directly as objects, while interfaces themselves cannot be instantiated but can be implemented by classes.
3. **Usage scenarios:** Classes are used to describe specific objects, while interfaces are used to define the behavior specifications of objects.
4. **Polymorphism:** Class inheritance and polymorphism are important features of object-oriented programming, and the implementation of interfaces can achieve polymorphism.

In many programming languages, classes and interfaces are two important concepts in object-oriented programming. They are usually used in different scenarios and purposes, but can also be used in combination to achieve more flexible designs.


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