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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does the reduce() method do?
💡 Hint: Think about combining elements.
Question 2
Easy
What does the identity value in reduce() represent?
💡 Hint: It's the starting point in our calculation.
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 purpose of the reduce() method in Java Streams?
- To filter elements
- To combine elements into a single result
- To sort elements
💡 Hint: Think about aggregation.
Question 2
True or False: The identity value can be any number you want.
- True
- False
💡 Hint: Consider what operations we can perform.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
You have a list of purchase prices. Write a Java program that calculates the total cost after applying tax. Assume a tax rate of 0.07 and the prices are represented in a List. Use reduction for the calculation.
💡 Hint: Consider using a decimal for the total.
Question 2
Explain how you would use reduce() to combine the lengths of names in a list into one string.
💡 Hint: Think about initializing with an empty string and adding lengths.
Challenge and get performance evaluation