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COS2614 Assignment 5 2024
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Question 1Not yet answered
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In the Observer pattern, what is the role of the subject?
a.
To listen for changes in the observer.
b.
To maintain a list of observers and notify them when its state changes.
c.
To execute the update method of the observer directly.
d.
To control access to its state by preventing any changes.
Question 2
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What does the `execute()` method of a ConcreteCommand typically do?
a.
It creates a new instance of Receiver.
b.
It directly calls the `do()` method of the Receiver.
c.
It adds a command to a stack or queue.
d.
It initializes a priority system for commands.
Question 3
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How does adding children in QObject differ from the classic Composite pattern?
a.
Children are automatically added through the `setParent()` function without the need for a dedicated
`addChild()` function.
b.
Children are added manually using an `addChild()` function as in the classic pattern.
c.
Children must be added in the constructor of the QObject.
d.
Children are added using a factory method in QObject.
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In what scenario would you use the Monostate pattern?
a.
When you need multiple instances with different states.
b.
When you need to restrict the number of instances created to one.
c.
When various parts of a program need to refer to the same state through different objects.
d.
When you want to delay object construction until it is explicitly needed.
Question 5
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What problem does the Command pattern solve?
a.
It provides a way to manage memory.
b.
It decouples a client from knowing when or how to execute a member function.
c.
It ensures multiple commands are executed simultaneously.
d.
It restricts the number of member functions a class can have.
Question 6
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Which class would you use to allow users to choose from a set of colors?
a.
QInputDialog
b.
QColorDialog
c.
QFontDialog
d.
QMessageBox
Question 7
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