Given below are two statements:

Statement I: subsystem models show logical grouping of objects into coherent subsystem

Statement II: State machine models show how objects change their states in response to events.

In the light of the above statements, choose the most appropriate answer from the options given below. 

The correct answer is Both Statement I and Statement II are correct 

Key Points

• Statement I: Subsystem models show logical grouping of objects into coherent subsystems.
• Explanation:
  • This statement is correct. Object-oriented design often involves many different objects, each with their own attributes and methods.
  • Subsystems are one way of managing this complexity by grouping related objects together.
  • A subsystem model therefore shows these groups of objects that are related and interact closely with each other.
  • For instance, in an online shopping system, all classes dealing with payment (like CreditCard, DebitCard, PayPal, etc.) could be grouped into a Payment subsystem.
• Statement II: State machine models show how objects change their states in response to events.
• Explanation:
  • This statement is also correct. In a substantial number of software applications, specifically those that deal with real-time systems, complex control systems, or certain types of business logic, objects can have different states.
  • For instance, an 'Order' object might have states like "New", "Payment Processing", "Dispatched", "Delivered", etc.
  • A state machine model represents the different states an object can have, and the ways (events or conditions) in which a transition happens from one state to another.