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Questions and Answers
Which of the following relationships is represented by the 'Has-A' association?
Which of the following relationships is represented by the 'Has-A' association?
- Decorator - Auto
- Teacher - Classroom
- Employee - Corporation (correct)
- Student - School
In the UML class diagram, what does the '-' symbol represent?
In the UML class diagram, what does the '-' symbol represent?
- Package visibility
- Protected visibility
- Private visibility (correct)
- Public visibility
What is the purpose of the Decorator design pattern?
What is the purpose of the Decorator design pattern?
- To create associations between classes
- To define the structure of a class
- To provide a way to extend the functionality of an object dynamically (correct)
- To represent the 'is-a' relationship between classes
Which of the following relationships is represented by the 'Is-A' generalization?
Which of the following relationships is represented by the 'Is-A' generalization?
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What does the '+' symbol represent in the UML class diagram?
What does the '+' symbol represent in the UML class diagram?
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Study Notes
UML Class Diagrams
- The 'Has-A' association represents a composition or aggregation relationship between two classes. This means one class owns or contains an instance of another class. For example, a car has-a engine.
- The '-' symbol in a UML class diagram represents a private member of a class. This means that the member can only be accessed within the class itself and not from outside.
- The Decorator design pattern aims to dynamically add responsibilities to an object. It allows you to wrap an existing object with another object, providing additional functionality without modifying the original object.
- The 'Is-A' generalization represents an inheritance relationship, meaning one class inherits properties and methods from another class. This establishes a parent-child relationship between classes.
- The '+' symbol in a UML class diagram represents a public member of a class. This means that the member can be accessed from anywhere, both within and outside the class.
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Description
This quiz covers the basics of design patterns, specifically focusing on the Decorator pattern. Learn about UML, the Gang of Four design patterns, and relationships in Java. Test your knowledge with this quiz.
