1. What is Lambda expression ? Junior A. a stream intermediate operation that transforms each element by applying a function, producing a new stream B. a container object that may or may not hold a non-null value, used to avoid null reference errors C. an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference D. a concise anonymous function written with arrow syntax that implements a functional interface
2. Which term means: "a concise anonymous function written with arrow syntax that implements a functional interface"? Junior A. Functional interface B. Stream C. Lambda expression D. collect operation
3. Which statement is correct? Junior A. Lambda expression — a concise anonymous function written with arrow syntax that implements a functional interface B. Lambda expression — an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference C. Lambda expression — a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map D. Lambda expression — a container object that may or may not hold a non-null value, used to avoid null reference errors
4. What is Functional interface ? Mid A. a concise anonymous function written with arrow syntax that implements a functional interface B. a container object that may or may not hold a non-null value, used to avoid null reference errors C. an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference D. a stream intermediate operation that keeps only the elements matching a given predicate
5. Which term means: "an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference"? Mid A. Optional B. filter operation C. collect operation D. Functional interface
6. Which statement is correct? Mid A. Functional interface — a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector B. Functional interface — an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference C. Functional interface — a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map D. Functional interface — a container object that may or may not hold a non-null value, used to avoid null reference errors
7. What is Stream ? Junior A. a concise anonymous function written with arrow syntax that implements a functional interface B. a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector C. a stream intermediate operation that transforms each element by applying a function, producing a new stream D. a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map
8. Which term means: "a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map"? Junior A. Stream B. Lambda expression C. collect operation D. map operation
9. Which statement is correct? Junior A. Stream — a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map B. Stream — a concise anonymous function written with arrow syntax that implements a functional interface C. Stream — an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference D. Stream — a stream intermediate operation that transforms each element by applying a function, producing a new stream
10. What is map operation ? Mid A. a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector B. a container object that may or may not hold a non-null value, used to avoid null reference errors C. a stream intermediate operation that transforms each element by applying a function, producing a new stream D. an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference
11. Which term means: "a stream intermediate operation that transforms each element by applying a function, producing a new stream"? Mid A. Optional B. collect operation C. Functional interface D. map operation
12. Which statement is correct? Mid A. map operation — a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector B. map operation — a container object that may or may not hold a non-null value, used to avoid null reference errors C. map operation — a stream intermediate operation that transforms each element by applying a function, producing a new stream D. map operation — a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map
13. What is filter operation ? Mid A. a stream intermediate operation that transforms each element by applying a function, producing a new stream B. a stream intermediate operation that keeps only the elements matching a given predicate C. a container object that may or may not hold a non-null value, used to avoid null reference errors D. an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference
14. Which term means: "a stream intermediate operation that keeps only the elements matching a given predicate"? Mid A. filter operation B. Functional interface C. collect operation D. Optional
15. Which statement is correct? Mid A. filter operation — a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map B. filter operation — a concise anonymous function written with arrow syntax that implements a functional interface C. filter operation — a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector D. filter operation — a stream intermediate operation that keeps only the elements matching a given predicate
16. What is collect operation ? Senior A. a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector B. a concise anonymous function written with arrow syntax that implements a functional interface C. a stream intermediate operation that transforms each element by applying a function, producing a new stream D. an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference
17. Which term means: "a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector"? Senior A. Lambda expression B. filter operation C. collect operation D. Stream
18. Which statement is correct? Senior A. collect operation — a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector B. collect operation — a stream intermediate operation that keeps only the elements matching a given predicate C. collect operation — a concise anonymous function written with arrow syntax that implements a functional interface D. collect operation — a container object that may or may not hold a non-null value, used to avoid null reference errors
19. What is Optional ? Senior A. a stream terminal operation that accumulates elements into a result container such as a list or map using a Collector B. a container object that may or may not hold a non-null value, used to avoid null reference errors C. a concise anonymous function written with arrow syntax that implements a functional interface D. a lazily-evaluated pipeline for processing a sequence of elements with operations like filter and map
20. Which term means: "a container object that may or may not hold a non-null value, used to avoid null reference errors"? Senior A. collect operation B. Lambda expression C. filter operation D. Optional
21. Which statement is correct? Senior A. Optional — a concise anonymous function written with arrow syntax that implements a functional interface B. Optional — a container object that may or may not hold a non-null value, used to avoid null reference errors C. Optional — a stream intermediate operation that keeps only the elements matching a given predicate D. Optional — an interface with exactly one abstract method, eligible to be implemented by a lambda or method reference