In a ForkJoinPool, what is the primary advantage over ExecutorService for recursive tasks?

The correct answer is B: Work-stealing algorithm for better load balancing. ForkJoinPool uses a work-stealing algorithm where idle threads can 'steal' tasks from busy threads' queues, providing better load balancing for divide-and-conquer problems.

What will be the result of executing this code? PriorityQueue pq = new PriorityQueue(); pq.add(5); pq.add(3); pq.add(7); System.out.println(pq.peek());

The correct answer is B: 3. PriorityQueue orders elements based on their natural ordering (min-heap by default). peek() returns 3, the minimum element.

Which class allows reading and writing objects to a stream?

The correct answer is B: ObjectInputStream and ObjectOutputStream. ObjectInputStream and ObjectOutputStream are used for serialization and deserialization of Java objects. Objects must implement Serializable interface.

Consider this code: List list = new CopyOnWriteArrayList(); list.add("A"); list.add("B"); Iterator itr = list.iterator(); list.add("C"); System.out.println(itr.next());

The correct answer is B: Prints 'A'. CopyOnWriteArrayList creates a snapshot for iterators, so modifications after iterator creation don't affect the iteration. Iterator sees only original elements: A and B.

Which interface must a class implement to be eligible for serialization in Java, and what is the significance of implementing it with no abstract methods?

The correct answer is B: Serializable interface; it's a marker interface with no abstract methods that indicates serialization capability. Serializable is a marker interface (contains no methods) that signals to the JVM that objects of that class can be serialized. The absence of abstract methods means implementing classes don't need to override any methods; they just need to implement the interface to indicate serialization support.

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Java Programming
Multithreading

Java OOP, collections, multithreading

22 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–22 of 22

Topics in Java Programming

All Basics & Syntax 100 OOP in Java 100 Collections Framework 100 Multithreading 100 Exception Handling 100 I/O Streams 100 JDBC 100 Generics 100 Lambda Expressions 100 Spring Framework Basics 58

Q.21 Easy Multithreading

Which method is used to stop a thread in Java?

A stop()

B interrupt()

C terminate()

D kill()

Correct Answer: B. interrupt()

EXPLANATION

The interrupt() method is the proper way to stop a thread in Java. The stop() method is deprecated and dangerous.

Test

Q.22 Easy Multithreading

Which interface must be implemented to create a thread in Java?

A Runnable

B Threadable

C Executable

D Processable

Correct Answer: A. Runnable

EXPLANATION

The Runnable interface is the correct interface to implement for creating threads in Java. It has a single abstract method run().

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Java Programming Multithreading

Java Programming
Multithreading