Example 1: abstract method python
from abc import ABC, abstractmethod class AbstractClassExample(ABC): def __init__(self, value): self.value = value super().__init__() @abstractmethod def do_something(self): pass
Example 2: class python
class MyClass(object): def __init__(self, x): self.x = x
Example 3: abstract 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.
Example 4: is it necessary for abstract class to have abstract method
No, abstract class can have zero abstract methods.
Example 5: 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 roar
Example 6: abstarct 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())
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