Java Programming

Java MCQ: What is the result of using the Java 9 method Set.of() with duplicate elements? a) It creates a Set with duplicate elements b) It creates a Set with the duplicates removed c) It throws an IllegalArgumentException d) It sorts the elements and removes duplicates Answer: c) It throws an IllegalArgumentException Explanation: Using the […]

Java MCQ: How does the module-info.java file contribute to Java 9’s module system? a) It specifies dependencies and defines module boundaries b) It replaces the main class in a Java application c) It is used for logging configuration d) It provides metadata for JAR files Answer: a) It specifies dependencies and defines module boundaries Explanation:

Java MCQ: What is a key benefit of using the JShell tool introduced in Java 9? a) It improves application performance b) It allows for interactive experimentation with Java code c) It replaces the Java compiler d) It provides a graphical user interface for Java development Answer: b) It allows for interactive experimentation with Java

Java MCQ: Which Java 9 method is used to create an immutable map with multiple entries? a) Map.of() b) Map.copyOf() c) Map.ofEntries() d) Map.unmodifiable() Answer: c) Map.ofEntries() Explanation: The Map.ofEntries() method, introduced in Java 9, is used to create an immutable map with multiple entries. This method is similar to Map.of() but allows for the

Java MCQ: Which method introduced in Java 9 allows the creation of an immutable Set? a) Set.copyOf() b) Set.of() c) Set.unmodifiable() d) Set.immutable() Answer: b) Set.of() Explanation: The Set.of() method, introduced in Java 9, allows the creation of an immutable Set. An immutable set is a set that cannot be modified after it is created,

Java MCQ: What is the purpose of the Java 9 List.of() method? a) To create a mutable List b) To create an immutable List c) To convert a List to a Set d) To sort a List Answer: b) To create an immutable List Explanation: The List.of() method introduced in Java 9 is used to

Java MCQ: Which new feature in Java 9 allows interfaces to have private methods? a) Private constructors b) Private methods in interfaces c) Private fields d) Private inner classes Answer: b) Private methods in interfaces Explanation: Java 9 introduced the ability to define private methods in interfaces. This feature allows interfaces to have methods that

Java MCQ: Which Java 9 feature allows developers to interactively evaluate code snippets? a) JavaFX b) JShell c) JConsole d) Javadoc Answer: b) JShell Explanation: JShell is a feature introduced in Java 9 that allows developers to interactively evaluate code snippets. JShell, also known as the REPL (Read-Eval-Print Loop) tool, provides an environment where developers

Java MCQ: What is the primary purpose of the Java Module System introduced in Java 9? a) To improve multithreading capabilities b) To encapsulate packages and improve code organization c) To replace the JDK d) To enhance the GUI framework Answer: b) To encapsulate packages and improve code organization Explanation: The primary purpose of the

Java MCQ: What is the result of using the Java 9 method Set.of() with duplicate elements? a) It creates a Set with duplicate elements b) It creates a Set with the duplicates removed c) It throws an IllegalArgumentException d) It sorts the elements and removes duplicates Answer: c) It throws an IllegalArgumentException Explanation: Using the

Java MCQ: How does the module-info.java file contribute to Java 9’s module system? a) It specifies dependencies and defines module boundaries b) It replaces the main class in a Java application c) It is used for logging configuration d) It provides metadata for JAR files Answer: a) It specifies dependencies and defines module boundaries Explanation:

Java MCQ: What is a key benefit of using the JShell tool introduced in Java 9? a) It improves application performance b) It allows for interactive experimentation with Java code c) It replaces the Java compiler d) It provides a graphical user interface for Java development Answer: b) It allows for interactive experimentation with Java

Java MCQ: Which Java 9 method is used to create an immutable map with multiple entries? a) Map.of() b) Map.copyOf() c) Map.ofEntries() d) Map.unmodifiable() Answer: c) Map.ofEntries() Explanation: The Map.ofEntries() method, introduced in Java 9, is used to create an immutable map with multiple entries. This method is similar to Map.of() but allows for the

Java MCQ: Which method introduced in Java 9 allows the creation of an immutable Set? a) Set.copyOf() b) Set.of() c) Set.unmodifiable() d) Set.immutable() Answer: b) Set.of() Explanation: The Set.of() method, introduced in Java 9, allows the creation of an immutable Set. An immutable set is a set that cannot be modified after it is created,

Java MCQ: What is the purpose of the Java 9 List.of() method? a) To create a mutable List b) To create an immutable List c) To convert a List to a Set d) To sort a List Answer: b) To create an immutable List Explanation: The List.of() method introduced in Java 9 is used to

Java MCQ: Which new feature in Java 9 allows interfaces to have private methods? a) Private constructors b) Private methods in interfaces c) Private fields d) Private inner classes Answer: b) Private methods in interfaces Explanation: Java 9 introduced the ability to define private methods in interfaces. This feature allows interfaces to have methods that

Java MCQ: Which Java 9 feature allows developers to interactively evaluate code snippets? a) JavaFX b) JShell c) JConsole d) Javadoc Answer: b) JShell Explanation: JShell is a feature introduced in Java 9 that allows developers to interactively evaluate code snippets. JShell, also known as the REPL (Read-Eval-Print Loop) tool, provides an environment where developers

Java MCQ: What is the primary purpose of the Java Module System introduced in Java 9? a) To improve multithreading capabilities b) To encapsulate packages and improve code organization c) To replace the JDK d) To enhance the GUI framework Answer: b) To encapsulate packages and improve code organization Explanation: The primary purpose of the

Java MCQ: Which of the following best describes the purpose of the DateTimeFormatter class in Java 8? a) To convert a date-time object to a String and vice versa b) To manage time zones c) To parse legacy date formats d) To store time zone rules Answer: a) To convert a date-time object to a

Java MCQ: Which Stream API method is used to execute a terminal operation that does not produce a result but applies an action to each element? a) collect() b) reduce() c) forEach() d) map() Answer: c) forEach() Explanation: The forEach() method in the Stream API is used to execute a terminal operation that does not

Java MCQ: What does the Optional.empty() method return? a) An empty List b) An Optional containing a null value c) An Optional with no value present d) An Optional containing an empty string Answer: c) An Optional with no value present Explanation: The Optional.empty() method returns an Optional with no value present. This method is

Java MCQ: What is the purpose of the method reference in Java 8? a) To reference the name of a method without invoking it b) To create multiple instances of a method c) To allow methods to be called using reflection d) To enable functions to be passed as arguments in a lambda expression Answer:

Java MCQ: What does the reduce() method in the Stream API do? a) Filters the elements of a stream b) Combines the elements of a stream into a single result c) Converts elements of a stream to another type d) Collects the elements of a stream into a List Answer: b) Combines the elements of

Java MCQ: Which Java 8 feature allows interfaces to include methods with implementations? a) Functional interfaces b) Default methods c) Lambda expressions d) Stream API Answer: b) Default methods Explanation: Default methods in Java 8 allow interfaces to include methods with implementations. This feature was introduced to enable interface evolution without breaking existing implementations. A

Java MCQ: Which method in the Stream API is used to convert elements to another type? a) filter() b) collect() c) map() d) reduce() Answer: c) map() Explanation: The map() method in the Stream API is used to convert elements of a stream to another type. It applies the provided function to each element in