Java

Java Development

Multithreading

Java Multithreading

Interview Preparation

Top 7 Advanced Java Multithreading Questions (With Detailed Explanations and Examples)

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Multithreading remains a critical skill for Java developers, especially when designing scalable, high-performance applications. Let’s dive into 7 advanced Java multithreading questions, complete with detailed explanations and examples to help you gain a solid understanding.

📌 What is the difference between a ThreadLocal variable and a shared variable in multithreading?

A ThreadLocal variable is unique to each thread accessing it, ensuring thread safety without explicit synchronization. Shared variables, on the other hand, are accessible by all threads, requiring synchronization to prevent race conditions.

Example:

public class ThreadLocalExample {
    private static ThreadLocal<Integer> threadLocal = ThreadLocal.withInitial(() -> 0);

    public static void main(String[] args) {
        Runnable task = () -> {
            threadLocal.set(threadLocal.get() + 1);
            System.out.println(Thread.currentThread().getName() + " - ThreadLocal value: " + threadLocal.get());
        };

        Thread t1 = new Thread(task, "Thread-1")…