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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does the map() function do in a Java Stream?
💡 Hint: Think about applying a function to each element.
Question 2
Easy
What will be printed by this code: List.of(1, 2, 3).stream().filter(x -> x > 2).forEach(System.out::println);?
💡 Hint: Consider the filtering condition.
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 type of operation is map() in the Stream API?
- Filtering
- Transformation
- Aggregation
💡 Hint: Consider how map changes data in the stream.
Question 2
True or False: filter() can remove elements from the stream based on a condition.
- True
- False
💡 Hint: Think about how filter processes data.
Solve 3 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Given a list of integers, write a Java stream operation that filters out odd numbers, doubles the remaining even numbers, and collects them into a Set.
💡 Hint: Focus on correctly using filter() before map() and consider using the right collector.
Question 2
Explain how you could use the reduce() operation to find the maximum value in a list.
💡 Hint: Combine the concept of reducing with comparing values.
Challenge and get performance evaluation