Java Concurrency Summary for interview preparation

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Java threads are an essential topic that every Java developer is expected to know. I have summarized important topics related to Java threads in this blog post.

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This should help you in quick revision of Java concurrency before your next interview.
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Agenda

• Thread Basics
  - Thread states
  - Thread Priority
  - Runnable and Callable
  - Futures and CompletableFutures
• Executor framework
  - Fork/Join pool
  - ThreadPools
• Lock mechanisms
  - Synchronized
  - Locking strategies
  — Optimistic lock
  — Pessimistic lock
  - Reentrant lock
  - ReadWriteLock
  - Lock fairness
• Java Memory Model
  - Instruction reordering
  - ThreadCache
  - ‘volatile’ keyword
  - Atomic variables and CAS
  - happens-before guarantee
• Other important points
  - Thread related methods
  - java.util.concurrent utilities
  - ThreadLocal
• Thread issues and debugging
  - Thread deadlock
  - Thread starvation
  - Thread…