Java 8 FP Quest

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A gamified FP jaunt through Java 8.

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Swati Nikam

India

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Java 8 FP Quest


Java 8 FP QuestOnline version A gamified FP jaunt through Java 8. by Swati Nikam 1 Beginner: Which lambda filters customers with balance > 1000 in a stream? a c -> c.balance > 1000 b c -> c.getBalance() > 1000 c c => c.getBalance() > 1000 d c -> { balance > 1000; } 2 Beginner: Which code sorts a list by name using a method reference? a Collections.sort(nameList) b Comparator.sortBy(Customer::getName) c Customer::getName d Comparator.comparing(Customer::getName) 3 Beginner: Which functional interface matches a function taking T and returning R? a Function b Supplier c Predicate d Consumer 4 Intermediate: Which operation creates a stream from a list and maps to ages? a stream(list).map(Person.age) b list.stream().map(Person::getAge) c list.stream().filter(Person::getAge) d list.map(Person::getAge) 5 Intermediate: Which concept is a closure in Java? a A lambda capturing final effectively final variables b A static class inside a class c An anonymous inner class with no access to outer vars d A variable declared inside a loop 6 Intermediate: Which method reference demonstrates a constructor reference? a Person::size b Person::new c new Person() d Person::getName 7 Advanced: Which is true about default methods in interfaces? a They provide an implementation that implementing classes inherit b They replace interfaces with abstract classes c They can’t call static methods d They force classes to override all methods 8 Advanced: What does a static method in an interface imply? a It belongs to the interface type, not instances b It cannot be used with lambdas c It can only be overridden by implementing classes d It requires an instance to be called 9 Advanced: Which higher-order function chain computes total length of all names? a names.stream().length().sum() b names.stream().forEach(String::length) c names.stream().map(String::length).reduce(0, Integer::sum) d names.map(String.length()).sum() 10 Advanced: Predict the output of this snippet: list.stream().filter(x -> x > 5).count() a It returns the number of elements greater than 5 b It mutates the list c It returns a boolean d It prints all elements

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Java 8 FP Quest

Quiz

About this activity

Created by

Download the paper version to play

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Java 8 FP QuestOnline version

by Swati Nikam

Beginner: Which lambda filters customers with balance > 1000 in a stream?

Beginner: Which code sorts a list by name using a method reference?

Beginner: Which functional interface matches a function taking T and returning R?

Intermediate: Which operation creates a stream from a list and maps to ages?

Intermediate: Which concept is a closure in Java?

Intermediate: Which method reference demonstrates a constructor reference?

Advanced: Which is true about default methods in interfaces?

Advanced: What does a static method in an interface imply?

Advanced: Which higher-order function chain computes total length of all names?

Advanced: Predict the output of this snippet: list.stream().filter(x -> x > 5).count()