Practice Observer Pattern (11.5.1) - Design Patterns in Java - Advance Programming In Java

Practice: Observer Pattern

Lesson 11.5.1Design Patterns in Java

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9 questions

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Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is an Observer in the Observer Pattern?
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Think about who needs to be informed of updates.
Question 2.
What does the Subject do?
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Consider what action it performs for its Observers.
3Question 3.
What is the main purpose of the Observer Pattern?
- To handle object creation
- To notify observers of state changes
- To compose objects
- None of the above
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Think about what happens when an event occurs.
4Question 4.
True or False: In the Observer Pattern, the Subject is tightly coupled with the Observers.
- True
- False
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Consider the benefits of this design pattern.
Question 5.
Design an Observer Pattern implementation for a stock market application where stocks' prices change frequently. Include multiple Observers that react to price updates.
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Consider how the investors would want to receive their updates.
Question 6.
Analyze the potential drawbacks of using the Observer Pattern in an application with thousands of Observers. What design considerations would you keep in mind?
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Think about how to manage the notification load effectively.

5 more questions in this section. Enroll free to practise them all.