Additional Notes
What role does the ‘Subject’ play in the Observer Pattern?
Track: Java
Topic: Software Architecture
Focus: Observer Pattern
Java: Observer Pattern
Answer
The Subject maintains a list of observers and notifies them of changes.
The subject is the core component that observers register with. It holds a list of observers and iterates over them to send updates. In a Java e-commerce application, the order processing system can be a subject that notifies observers like a shipment service when an order is completed.
The subject is the core component that observers register with. It holds a list of observers and iterates over them to send updates. In a Java e-commerce application, the order processing system can be a subject that notifies observers like a shipment service when an order is completed.
Topics: Java Observer Pattern Software Architecture