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Coder Trainee

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Latest from Coder Trainee

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Coder Trainee

Jul 14, 2026 · Backend Development

Top 10 Must‑Know Spring Interview Questions for Java Developers

This article walks through the ten most frequently asked Spring interview topics—including IoC/DI concepts, bean lifecycle, AOP mechanics, circular‑dependency resolution, @Transactional behavior, Spring Boot startup steps, auto‑configuration, @Autowired vs @Resource, bean scopes, and the differences between servlet filters and Spring interceptors—providing concrete code examples and key points that can earn interviewers' extra credit.

AOPBean ScopeDependency Injection

0 likes · 12 min read

Top 10 Must‑Know Spring Interview Questions for Java Developers

Coder Trainee

Jul 13, 2026 · Fundamentals

Top 10 Must‑Ask JVM Interview Questions

This article presents ten essential JVM interview questions, covering the Java 8 memory model, object allocation flow, common GC algorithms and collectors, class‑loading mechanics, OOM and CPU‑spike troubleshooting, tuning parameters, and the differences among strong, soft, weak and phantom references.

Class LoadingJVMJava Interview

0 likes · 12 min read

Coder Trainee

Jul 12, 2026 · Backend Development

10 Must‑Know Java Concurrency Interview Questions

This article walks through ten essential Java concurrency interview topics—including the Java Memory Model, volatile semantics, synchronized lock upgrades, CAS pitfalls, AQS internals, ReentrantLock versus synchronized, ThreadPoolExecutor parameters, ThreadLocal memory‑leak issues, CountDownLatch vs CyclicBarrier, and deadlock conditions—providing code snippets, tables and detailed explanations to help candidates answer interview questions confidently.

AQSCASDeadlock

0 likes · 12 min read

10 Must‑Know Java Concurrency Interview Questions

Coder Trainee

Jul 11, 2026 · Fundamentals

Top 10 Must‑Know Java Collection Interview Questions (Part 2)

This article walks through ten core Java collection topics—including ArrayList vs LinkedList, HashMap internals across JDK 7 and 8, the put and resize processes, ConcurrentHashMap design, HashSet implementation, fail‑fast vs fail‑safe iterators, and the difference between Collection and Collections—providing the detailed analysis and code examples interviewers expect.

ConcurrentHashMapHashMapJava

0 likes · 10 min read

Top 10 Must‑Know Java Collection Interview Questions (Part 2)

Coder Trainee

Jul 10, 2026 · Fundamentals

Java Concurrency Deep Dive – Part 8: Real‑World Pitfalls and Post‑mortem

This article reviews common Java concurrency pitfalls—including deadlocks, ThreadLocal memory leaks, Integer‑cache loops, unbounded thread‑pool queues, and swallowed exceptions—illustrates each with code samples, analyzes real production incidents, and provides a concise checklist and tool‑selection guide for safe concurrent programming.

ConcurrentHashMapDeadlockJava

0 likes · 9 min read

Java Concurrency Deep Dive – Part 8: Real‑World Pitfalls and Post‑mortem

Coder Trainee

Jul 8, 2026 · Backend Development

Deep Dive into Java Concurrency: Analyzing the ConcurrentHashMap Source (Part 7)

This article thoroughly examines Java's ConcurrentHashMap by tracing its evolution from JDK 1.5's segment‑lock design to JDK 8's CAS‑plus‑synchronized implementation, detailing internal structures, put/get algorithms, resizing mechanics, performance trade‑offs, and common interview questions.

ConcurrentHashMapJDK7JDK8

0 likes · 12 min read

Deep Dive into Java Concurrency: Analyzing the ConcurrentHashMap Source (Part 7)

Coder Trainee

Jul 7, 2026 · Backend Development

Deep Dive into Java ThreadPoolExecutor: Source Code Analysis (Part 6)

This article provides a thorough, source‑level walkthrough of Java's ThreadPoolExecutor, covering its core design, state machine, seven key parameters, task‑submission flow, worker creation, execution loop, rejection policies, common pool variants, and interview‑ready explanations of the execute() process.

BlockingQueueExecutorServiceJava

0 likes · 10 min read

Deep Dive into Java ThreadPoolExecutor: Source Code Analysis (Part 6)

Coder Trainee

Jul 6, 2026 · Backend Development

Deep Dive into Java Concurrency: Practical ReentrantLock and Condition Usage

This article thoroughly compares Java's synchronized keyword with ReentrantLock, explains lock implementation details, fairness, interruptibility, timeout, and Condition usage, provides practical code examples and interview tips, and offers guidance on when to choose each synchronization mechanism.

AQSConditionJava

0 likes · 8 min read

Deep Dive into Java Concurrency: Practical ReentrantLock and Condition Usage

Coder Trainee

Jul 5, 2026 · Fundamentals

Deep Dive into Java Concurrency: Inside the AQS Source Code (Part 4)

This article provides a thorough technical walkthrough of Java's AbstractQueuedSynchronizer, covering its core state and CLH queue structures, exclusive and shared lock acquisition/release processes, Condition implementation, and interview-ready explanations of its underlying mechanisms.

AQSAbstractQueuedSynchronizerCondition

0 likes · 8 min read

Deep Dive into Java Concurrency: Inside the AQS Source Code (Part 4)