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1. Designing Object Interactions

2. What Are Object Interactions ? Objects interact by sending messages to each other to collaborate and achieve specific functionality. I mportance: Modularity Scalability M aintainability

3. Key Concepts in Object Interaction 1 Messages Objects communicate by calling each other’s methods. 2 Collaboration Objects work together to fulfill system requirements. 3 Encapsulation: Only expose necessary methods to other objects.

4. Steps in Designing Object Interactions Identify Collaborating Objects: Determine which objects need to interact based on system requirements. Define Responsibilities: Assign tasks and responsibilities to each object. Establish Communication: Decide how objects will send and receive messages (method calls or events).

5. Tools for Designing Object Interactions UML Sequence Diagrams: Visualize how objects interact over time.Show method calls, object creation, and responses. Collaboration Diagrams: Display relationships and interactions between objects

6. Examples to Explain Concepts 1 A coffee machine and a user—how they interact (pressing buttons and brewing coffee). 2 E-commerce checkout process where a Cart, User, and Payment Processor interact.

7. Tips for Effective Interaction Design 1 Keep interactions simple and direct. 2 Avoid unnecessary dependencies between objects. 3 Use design patterns (e.g., Observer, Mediator) for complex interactions.