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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What method would you use to collect stream elements into a List?
💡 Hint: Think about what data structure you want to use to store the elements.
Question 2
Easy
How can you ensure that elements collected from a stream are unique?
💡 Hint: What type of collection automatically removes duplicates?
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 purpose of Stream Collectors?
- To modify the elements of a stream
- To accumulate elements into collections
- To execute functions on streams
💡 Hint: Think about what you usually do after processing a stream.
Question 2
True or False: the toSet() collector allows duplicate elements.
- True
- False
💡 Hint: What happens when you try to add a duplicate to a Set?
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a Java program that accepts a list of strings, collects them into a HashSet using toSet(), and then outputs the size of the set.
💡 Hint: How do you switch from a List to a Set in your code?
Question 2
Write a code snippet that groups strings by their initial character and outputs the resulting Map.
💡 Hint: What function can you use to determine the initial character?
Challenge and get performance evaluation