Top 50 Multithreading Interview Questions and Answers

Threading is a technique to execute multiple tasks concurrently. Multithreading can be implemented using threads.

• Threading allows multiple tasks to run concurrently, improving performance and responsiveness.

• Threads are lightweight processes that shar...read more

Use two threads to print numbers 1-10 in correct order

• Create two threads, one for printing odd numbers and one for printing even numbers

• Use synchronization mechanisms like mutex or semaphore to ensure correct order

• Example: Thread 1 prints 1, 3, 5, 7,...read more

A program to simulate a race with 5 people using multithreading and determine the winner.

• Create a class for the race participants

• Implement the Runnable interface for each participant

• Use a thread pool to manage the threads

• Start all threads simultaneou...read more

Runnable interface is used for running a task, while Callable interface is used for returning a result after running a task.

• Runnable interface has a run() method that does not return any value.

• Callable interface has a call() method that returns a val...read more

Code using multithreading to scan 3 log files for different patterns and write matches in o/p file with low memory footprint.

• Use Python's threading module to create multiple threads for each log file

• Use regex to search for patterns in each log file

• Wr...read more

Multithreading involves concurrent execution of threads, while asynchronous programming allows non-blocking operations using callbacks or promises.

• Multithreading uses multiple threads to execute tasks simultaneously, e.g., a web server handling multi...read more

Node.js is single-threaded, but we can utilize multiple threads using worker threads module.

• Node.js is designed to be single-threaded for better performance and scalability.

• However, we can make use of the worker threads module to run JavaScript code ...read more

Designing a high scale Multithreaded system requires careful consideration of thread synchronization, load balancing, and resource management.

• Identify the critical sections of code that need to be synchronized

• Choose an appropriate synchronization mec...read more

Print even and odd numbers using different threads

• Create two threads, one for printing even numbers and one for printing odd numbers

• Use synchronization mechanisms like mutex or semaphore to ensure proper ordering of output

• Example: Thread 1 prints eve...read more

The 1PB file can be read using 4 threads by dividing the file into smaller chunks and assigning each thread to read a chunk.

• Divide the file into smaller chunks of equal size.

• Assign each thread to read a specific chunk of the file.

• Ensure synchronizati...read more

Printing odd and even numbers in sequence using threads.

• Create two threads, one for odd and one for even numbers.

• Use a shared variable to keep track of the current number.

• Use synchronized block to ensure only one thread is executing at a time.

• Use wai...read more

Multitasking is executing multiple tasks simultaneously while multithreading is executing multiple threads within a single process.

• Multitasking involves running multiple processes at the same time while multithreading involves running multiple thread...read more

Fixed thread pool has a fixed number of threads while cached thread pool creates new threads as needed.

• Fixed thread pool is suitable for tasks with a known number of threads

• Cached thread pool is suitable for tasks with unknown number of threads

• Fixed ...read more

Multithreading is not natively supported in JavaScript, but can be achieved through Web Workers.

• JavaScript is a single-threaded language, meaning it can only execute one task at a time.

• Web Workers allow for multithreading in JavaScript by running scr...read more

Join is used to wait for a thread to finish execution before continuing with the main thread.

• Join ensures that all the threads finish their execution before the main thread exits.

• It is used to avoid race conditions and deadlocks.

• Join can be used with...read more

Use two threads to print even and odd numbers in sequence

• Create two threads, one for printing even numbers and one for printing odd numbers

• Use synchronization mechanisms like mutex or semaphore to ensure numbers are printed in sequence

• Start both thre...read more

Yes, task.run creates a new thread.

• task.run schedules a task to run on a thread pool thread.

• It is used to run a task asynchronously.

• It is similar to Task.Factory.StartNew method.

Multithreading allows multiple threads to run concurrently, while semaphores are used to control access to shared resources in a synchronized manner.

• Multithreading involves running multiple threads within a single process, allowing for parallel execu...read more

Multiprocessing involves multiple processes running concurrently, while multithreading involves multiple threads within a single process.

• Multiprocessing uses multiple processes to execute tasks simultaneously.

• Multithreading uses multiple threads with...read more

Executor framework provides a way to execute tasks asynchronously using multithreading.

• Executor framework provides a way to manage thread pools and execute tasks asynchronously.

• It uses a pool of threads to execute tasks and provides a way to submit t...read more

Printing names of 4 threads in a given order using an array of strings.

• Create an array of strings with the names of the threads in the desired order.

• Use a loop to iterate through the array and print each thread name.

• Ensure that the threads are starte...read more

Java 8 multithreading can efficiently move an element from the start of an array to the end using streams and parallel processing.

• Use Java 8 Streams to process collections in parallel.

• Example: Convert array to List, remove first element, add it to th...read more

Program to print even and odd numbers from 1 to 20 using 2 threads alternately.

• Create two threads, one for printing even numbers and one for printing odd numbers.

• Use wait(), notify(), and notifyAll() to ensure alternate printing.

• Ensure synchronizatio...read more

Program to print odd and even numbers using multithreading

• Create two separate threads for printing odd and even numbers

• Use synchronization mechanisms like mutex or semaphore to ensure proper ordering of output

• Example: Thread 1 prints odd numbers (1, ...read more

An ordering system with multithreading for efficient processing

• Use a queue data structure to store incoming orders

• Create multiple threads to process orders concurrently

• Implement synchronization mechanisms to prevent race conditions

• Consider using a th...read more

Multi-threading is a programming concept where multiple threads within a process execute independently to improve performance.

• Allows multiple tasks to be executed concurrently within a single process

• Improves performance by utilizing multiple CPU core...read more

Use Callable interface to return Object from Thread

• Implement Callable interface instead of Runnable

• Use ExecutorService to submit Callable and get Future object

• Call get() method on Future object to retrieve the returned Object