1.6.2 - Common Functional Operations
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Practice Questions
Test your understanding with targeted questions
What does the map() function do in a Java Stream?
💡 Hint: Think about applying a function to each element.
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.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What type of operation is map() in the Stream API?
💡 Hint: Consider how map changes data in the stream.
True or False: filter() can remove elements from the stream based on a condition.
💡 Hint: Think about how filter processes data.
3 more questions available
Challenge Problems
Push your limits with advanced challenges
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.
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.
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