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OOP - 5.2

Contract Programming

QuestionAnswer
A way of writing software where each class and method declares a contract Contract Programming
what it expects preconditions
what it guarantees postconditions
must always hold true about its state invariants
3 Core Concepts: preconditions postconditions invariants
- What must be true before a method runs. - Responsibility of the caller - If violated, method should reject execution. - Ex. The number must not be negative Preconditions
What must be true after the method finishes. - Responsibility of the method itself - Ensures correct behavior and output. - Ex. The result is completely computed Postconditions
- What must always be true for an object - Maintained throughout the object’s lifetime - Ex. A bank account balance is never negative Invariants
Roles in Contract Programming Caller or Client Implementer or Supplier Method or Service Provider
The caller is the part of the program that invokes a method or requests a services Caller or Client
The implementer is the developer or class responsible for writing the method and enforcing the contract Implementer or Supplier
The method is the actual implementation where the contract is executed. Method or Service Provider
Created by: user-1782765
 

 



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