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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the purpose of the Comparator interface?
💡 Hint: Think about how you would sort a list differently than its natural order.
Question 2
Easy
How do you make a collection unmodifiable?
💡 Hint: Recall the Collections class in Java.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the primary use of the Comparator interface?
- To sort objects in natural order
- To define custom sort orders
- To store objects
💡 Hint: Think about when you might need a different order.
Question 2
True or False: All collections in Java can be modified.
- True
- False
💡 Hint: Remember the concept of immutability in collections.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a custom comparator that sorts a list of Employee objects first by their salary in descending order, and then by their name in alphabetical order if salaries are equal. Write code to demonstrate this.
💡 Hint: Focus on how to prioritize the salary field first.
Question 2
Discuss potential risks of using synchronized collections and propose best practices for their use.
💡 Hint: Think about what can go wrong when multiple threads are accessing shared data.
Challenge and get performance evaluation