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Explain Java concurrency and fix i++ race

Last updated: Mar 29, 2026

Quick Overview

This question evaluates understanding of Java concurrency constructs (Thread/Runnable/Callable), the Java Memory Model, synchronization primitives (volatile, synchronized, Lock, Atomic classes), and the ability to reason about atomicity and race conditions such as lost updates from i++.

  • medium
  • WeRide
  • Software Engineering Fundamentals
  • Software Engineer

Explain Java concurrency and fix i++ race

Company: WeRide

Role: Software Engineer

Category: Software Engineering Fundamentals

Difficulty: medium

Interview Round: Technical Screen

## Java 1. Java - ThreadRunnable/Callable - Java Memory Model - `volatile``synchronized``Lock`Atomic* 2. `i++` “/lost update” 3. - `i++` - 4. > JDK

Quick Answer: This question evaluates understanding of Java concurrency constructs (Thread/Runnable/Callable), the Java Memory Model, synchronization primitives (volatile, synchronized, Lock, Atomic classes), and the ability to reason about atomicity and race conditions such as lost updates from i++.

WeRide logo
WeRide
Oct 2, 2025, 12:00 AM
Software Engineer
Technical Screen
Software Engineering Fundamentals
2
0

Java

  1. Java
  • ThreadRunnable/Callable
  • Java Memory Model
  • volatile``synchronized``Lock Atomic*
  1. i++ “/lost update”
    • i++

JDK

Solution

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