Java 9 Mock Test

This section presents you various set of Mock Tests related to Java 9. You can download these sample mock tests at your local machine and solve offline at your convenience. Every mock test is supplied with a mock test key to let you verify the final score and grade yourself.

Java 9 Mock Test III

Q 1 - Which of the following is a correct statement about try-with-resources statement?

A - The try-with-resources statement is a try statement with one or more resources duly declared.

B - Any object implementing java.lang.AutoCloseable or java.io.Closeable, interface can be used as a resource.

C - The try-with-resources statement ensures that each resource is closed after the requiredment finishes.

D - All of the above

Answer : D

Explanation

All of the above options are correct.

Q 2 - Which of the following is a correct statement about try-with-resources statement in Java 9?

A - Prior to Java 9, resources are to be declared before try or inside try statment.

B - Any object implementing java.lang.AutoCloseable or java.io.Closeable, interface can be used as a resource.

C - The try-with-resources statement ensures that each resource is closed after the requiredment finishes.

D - All of the above

Answer : D

Explanation

All of the above options are correct.

Q 3 - Which of the following is a correct statement about try-with-resources statement in Java 9?

A - Prior to Java 9, resources are to be declared before try or inside try statment.

B - In Java 9, resources are not required to be declared before try or inside try statment.

C - Both of the above.

D - None of the above

Answer : C

Explanation

Both of the above options are correct.

Q 4 - 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

Answer : C

Explanation

Both of the above options are correct.

Q 5 - A program element annotated with @Deprecated means it should not be used for

A - Its usage may leads to errors

B - It may be incompatible in future version.

C - Both of the above.

D - None of the above

Answer : C

Explanation

Both of the above options are correct.

Q 6 - A program element annotated with @Deprecated means it should not be used for

A - It may be removed in future version.

B - A better and efficient alternative has superseeded it.

C - Both of the above.

D - None of the above

Answer : C

Explanation

Both of the above options are correct.

Q 7 - Which of the following is a correct statement about @Deprecated Annoation?

A - forRemoval indicates whether the annotated element is subject to removal in a future version.

B - Default value of forRemoval is false.

C - Both of the above.

D - None of the above

Answer : C

Explanation

Both of the above options are correct.

Q 8 - Which of the following is a correct statement about @Deprecated Annoation?

A - since returns the version in which the annotated element became deprecated.

B - Default value of since is empty string.

C - Both of the above.

D - None of the above

Answer : C

Explanation

Both of the above options are correct.

Q 9 - In which of the following version of java diamond operator was introduced?

A - Java 7

B - Java 8

C - Java 9

D - None of the above

Answer : A

Explanation

Diamond operator was introduced in java 7.

Q 10 - In which of the following version of java diamond operator can be used with anonymous inner classes?

A - Java 7

B - Java 8

C - Java 9

D - None of the above

Answer : C

Explanation

In java 9, diamond operator can be used with annonymous class to simplify code and improves readability.

Q 11 - In which of the following version of java Optional Class was introduced?

A - Java 7

B - Java 8

C - Java 9

D - None of the above

Answer : B

Explanation

Optional Class was introduced in Java 8 to avoid null checks and NullPointerException issues.

Q 12 - 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

Answer : C

Explanation

Optional Class was introduced in Java 8 to avoid null checks and NullPointerException issues.

Q 13 - 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

Answer : A

Explanation

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

Q 14 - Which of the following correctly describes the ifPresentOrElse() 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

Answer : B

Explanation

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

Q 15 - Which of the following correctly describes the or() 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 - If a value is present, returns an Optional describing the value, otherwise returns an Optional produced by the supplying function.

D - None of the above

Answer : C

Explanation

If a value is present, returns an Optional describing the value, otherwise returns an Optional produced by the supplying function.

Answer Sheet

Question Number	Answer Key
1	D
2	D
3	C
4	C
5	C
6	C
7	C
8	C
9	A
10	C
11	B
12	C
13	A
14	B
15	C

Download

java9_questions_answers.htm