The Common Scenario-Based Java Interview Questions: A Comprehensive Guide

source: naukri.com

In technical interviews, employers often present real-world scenarios to assess how candidates approach and solve problems. This article covers common scenario-based Java interview questions that you might encounter, along with detailed solutions and explanations.

Scenario 1: Thread Deadlock Detection

Interviewer: “You have a system where multiple threads are running, and users are reporting that the application occasionally freezes. How would you identify if there’s a deadlock, and how would you fix it?”

Solution: Here’s a simple example that creates a deadlock situation:

public class DeadlockExample {
    private static Object resource1 = new Object();
    private static Object resource2 = new Object();
    
    public static void main(String[] args) {
        Thread thread1 = new Thread(() -> {
            synchronized (resource1) {
                System.out.println("Thread 1: Holding resource 1");
                try { Thread.sleep(100);} catch (Exception e) {}
                System.out.println("Thread 1: Waiting for resource 2");
                synchronized (resource2) {
                    System.out.println("Thread 1: Holding resource 1 and resource 2");
                }
            }
        })…