Java 9 - Online Quiz

Q 1 - Which of the following is/are introduced in Java 9?

A - Module System

B - JShell

C - Multiresolution Image API

D - All of the above

Q 2 - What REPL stands for?

A - Read Eval Print Loop

B - Reactive Efficient Printable Live

C - REplaceable PLatform.

D - None of the above.

Q 3 - Which of the following method is correct about Set in Java 9?

A - For Set interfaces, of(...) method is overloaded to have 0 to 10 parameters.

B - For Set interfaces, of(...) method is overloaded to have var arg as parameter.

C - Both of the above.

D - None of the above.

Q 4 - Which of the following is a not valid member of interface till Java 8?

A - Private static methods

B - Default method

C - Static methods

D - All of the above.

Q 5 - Which of the following is a correct statement about takeWhile() method of Stream class in Java 9?

A - takeWhile method takes all the values until the predicate returns false.

B - It returns, in case of ordered stream, a stream consisting of the longest prefix of elements taken from this stream matching the given predicate.

C - Both of the above

D - None of the above

Q 6 - Which of the following is a correct statement about @Deprecated Annoation?

A - @Deprecated annotation was introduced in java 5 version.

B - Compiler generates warnings whenever a deprecated element is used.

C - Both of the above.

D - None of the above

Q 7 - What is the purpose of Optional Class?

A - To avoid null checks

B - To avoid NullPointerException issues

C - Both of the above

D - None of the above

Q 8 - Which of the following correctly describes the stream() method of Optional class?

A - If a value is present, it returns a sequential Stream containing only that value, otherwise returns an empty Stream.

B - If a value is present, performs the given action with the value, otherwise performs the given empty-based action.

C - Both of the above

D - None of the above

Q 9 - Which of the following correctly describes the getResolutionVariants() method of MultiresolutionImage Interface?

A - Gets a specific image which is best variant to represent this logical image at the indicated size.

B - Gets a readable list of all resolution variants.

C - Both of the above

D - None of the above

Q 10 - Which of the following correctly describes the newIncompleteFuture() method of CompletableFuture Interface?

A - Returns a new incomplete CompletableFuture of the type to be returned by a CompletionStage method.

B - Returns a new CompletableFuture which is already completed with the given value.

C - Returns a new CompletionStage which is already completed with the given value and supports only those methods present in interface CompletionStage.

D - Returns a new CompletionStage which is already completed exceptionally with the given exception and supports only those methods present in interface CompletionStage.