class python
class MyClass(object):
def __init__(self, x):
self.x = xclass python
class MyClass(object):
def __init__(self, x):
self.x = xabstract class in java
Sometimes we may come across a situation where we cannot provide
implementation to all the methods in a class. We want to leave the
implementation to a class that extends it. In such case we declare a class
as abstract.To make a class abstract we use key word abstract.
Any class that contains one or more abstract methods is declared as abstract.
If we don’t declare class as abstract which contains abstract methods we get
compile time error.
1)Abstract classes cannot be instantiated
2)An abstarct classes contains abstract method, concrete methods or both.
3)Any class which extends abstarct class must override all methods of abstract
class
4)An abstarct class can contain either 0 or more abstract method.python abstract class
# Python program showing
# abstract base class work
from abc import ABC, abstractmethod
class Animal(ABC):
def move(self):
pass
class Human(Animal):
def move(self):
print("I can walk and run")
class Snake(Animal):
def move(self):
print("I can crawl")
class Dog(Animal):
def move(self):
print("I can bark")
class Lion(Animal):
def move(self):
print("I can roar")
# Driver code
R = Human()
R.move()
K = Snake()
K.move()
R = Dog()
R.move()
K = Lion()
K.move()
Output:
I can walk and run
I can crawl
I can bark
I can roarabstarct class python
import abc
class Shape(metaclass=abc.ABCMeta):
@abc.abstractmethod
def area(self):
pass
class Rectangle(Shape):
def __init__(self, x,y):
self.l = x
self.b=y
def area(self):
return self.l*self.b
r = Rectangle(10,20)
print ('area: ',r.area())is it necessary for abstract class to have abstract method
No, abstract class can have zero abstract methods.abstract class python
An abstract class exists only so that other "concrete" classes can inherit from the abstract class.Copyright © 2021 Codeinu
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