10+ MessageBroadcast Interview Questions and Answers

Program to find duplicates in two lists and print them in notepad

• Iterate through each element in the first list and check if it exists in the second list

• If a duplicate is found, print it to a notepad file

• Use a hash set to store elements from the first list for efficient lookup

A thread pool is a collection of worker threads that efficiently execute asynchronous tasks.

• Thread pool helps in managing and reusing a pool of threads to execute tasks concurrently.

• It improves performance by reducing the overhead of creating new threads for each task.

• Thread pool can limit the number of concurrent threads to prevent resource exhaustion.

• Examples include Java's Executor framework and .NET's ThreadPool class.

Lookup annotation in Spring Boot is used to indicate that a method should be cached for faster retrieval.

• Lookup annotation is used in conjunction with @Cacheable annotation to cache the result of a method.

• It is commonly used in Spring Boot applications to improve performance by caching frequently accessed data.

• Example: @Lookup @Cacheable("books") public List findAllBooks() { return bookRepository.findAll(); }

Memory management in Java refers to the process of allocating and deallocating memory for objects in the Java Virtual Machine (JVM).

• Java uses automatic memory management through garbage collection to handle memory allocation and deallocation.

• Memory in Java is divided into two main areas: stack memory and heap memory.

• Stack memory is used for storing primitive data types and references to objects, while heap memory is used for storing objects themselves.

• Java automatically manag...read more

Program to print numbers from 100 to 1

• Use a loop to iterate from 100 to 1

• Print the current number in each iteration

Implement a stack using array in a program

• Create an array to store the stack elements

• Implement push and pop functions to add and remove elements from the stack

• Keep track of the top of the stack using a variable

Creating a form in React without any libraries

• Use state to manage form data

• Use onChange event to update state as user types

• Use onSubmit event to handle form submission

A critical section is a part of a program where shared resources are accessed and must be protected from concurrent access.

• Critical sections are used to prevent race conditions and ensure data integrity.

• They are typically protected using locks or other synchronization mechanisms.

• Only one thread can execute the critical section at a time.

• Examples include accessing a shared database, updating a global variable, or modifying a linked list.

HashMap is a key-value pair collection while HashSet is a collection of unique elements.

• HashMap stores key-value pairs while HashSet stores unique elements

• HashMap allows duplicate values but keys must be unique, HashSet does not allow duplicates

• HashMap uses keys to retrieve values, HashSet does not have keys

Java OOPs concept is a programming paradigm that focuses on objects and their interactions.

• OOPs stands for Object-Oriented Programming System

• It is based on the concepts of classes and objects

• Encapsulation, Inheritance, Polymorphism, and Abstraction are the four main pillars of OOPs

• Java supports all the OOPs concepts

• Example: A class 'Car' can have properties like 'color', 'model', and 'year' and methods like 'start', 'stop', and 'accelerate'

Merging two linked lists involves combining the elements of both lists into a single sorted list.

• Create a new linked list to store the merged list

• Compare the values of the nodes from both lists and add the smaller value to the merged list

• Move the pointer of the list with the smaller value to the next node

• Repeat the comparison and addition until both lists are exhausted

• If one list is exhausted, append the remaining nodes of the other list to the merged list