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Learn Java Streams – Module 1 Lesson 3 – Quiz

Last updated: September 27, 2025

Written by: komal

Learn Java Streams
Lesson 2: Functional Interfaces and Lambdas in Java
Learn Java Streams – Module 1 Lesson 3 – Quiz

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Question 1 of 5

1. Question

What makes an interface a functional interface in Java?

It must extend the Runnable interface
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It must only contain static methods
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It must be annotated with @FunctionalInterface
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It must declare exactly one abstract method
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Question 2 of 5

2. Question

Which built-in functional interface is best suited for transforming one value into another of a possibly different type?

Function
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Consumer
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Supplier
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Predicate
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Question 3 of 5

3. Question

Which of these is a valid lambda expression in Java (select all that apply)?

(x, y) => x + y
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(x, y) : x + y
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(x, y) -> x + y
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(x, y) -> { return x + y; }
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Question 4 of 5

4. Question

Which statement correctly describes the variables that a lambda expression is allowed to use from the surrounding scope?

Lambda expressions can only use variables declared explicitly as final
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Lambda expressions can freely modify local variables from the surrounding scope
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Lambda expressions can use variables that are reassigned after the lambda is created
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Lambda expressions can use local variables that are assigned once and never reassigned, even if not declared final
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Question 5 of 5

5. Question

Which of the following is the correct method reference syntax for an instance method of a particular object?

ClassName::method
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instance::method
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ClassName.instance::method
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ClassName::new
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