Concept of Aggregation
Aggregation is a concept in which an object of one class can own or access another independent object of another class.
- It represents Has-A’s relationship.
- It is a unidirectional association i.e. a one-way relationship. For example, a department can have students but vice versa is not possible and thus unidirectional in nature.
- In Aggregation, both the entries can survive individually which means ending one entity will not affect the other entity.
Python3
# Code to demonstrate Aggregation # Salary class with the public method # annual_salary() class Salary: def __init__(self, pay, bonus): self.pay = pay self.bonus = bonus def annual_salary(self): return (self.pay*12)+self.bonus # EmployeeOne class with public method # total_sal() class EmployeeOne: # Here the salary parameter reflects # upon the object of Salary class we # will pass as parameter later def __init__(self, name, age, sal): self.name = name self.age = age # initializing the sal parameter self.agg_salary = sal # Aggregation def total_sal(self): return self.agg_salary.annual_salary() # Here we are creating an object # of the Salary class # in which we are passing the # required parameters salary = Salary(10000, 1500) # Now we are passing the same # salary object we created # earlier as a parameter to # EmployeeOne class emp = EmployeeOne('Geek', 25, salary) print(emp.total_sal()) |
Output:
121500
From the above code, we will get the same output as we got before using the Composition concept. But the difference is that here we are not creating an object of the Salary class inside the EmployeeOne class, rather than that we are creating an object of the Salary class outside and passing it as a parameter of EmployeeOne class which yields the same result.
Python OOPS – Aggregation and Composition
In this article, we will compare and highlight the features of aggregation and Composition in Python OOPS.
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