Java 9 - Online Quiz

Q 1 - Java 9 main goals are

A - To make JDK and Java Standard Edition platform modular based in the sense that it can be scalled down to small computing devices well.

B - To improve the overall security of the JDK and Java Implementations.

C - Both of the above

D - None of the above.

Q 2 - Which of the following is correct w.r.t Java Documentation?

A - Java documentation can be generated using javadoc tool.

B - Java currently generates documentation in html 4.0 format.

C - In java 9, we can generate documentation in html 5 format by using -html5 option in command line arguments.

D - All of the above.

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

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

B - For Map interfaces, ofEntries(...) method is having 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 method

B - Default method

C - Static method

D - All of the above.

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

A - dropWhile method throw away all the values at the start until the predicate returns true.

B - It returns, in case of ordered stream, a stream consisting of the remaining elements of this stream after dropping the longest prefix of elements 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 - What is goal behind MultiResolutionImage Interface?

A - It supports multiple images with different resolution variants.

B - This allows a set of images with different resolution to be used as a single multi-resolution image.

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.