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Java Basics: Beyond the Fundamentals
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Module 7
The Java Memory Model (JMM)
1
Concurrency Concerns: Visibility, Atomicity, and Ordering
Distinguish between visibility, atomicity, and ordering as separate concurrency concerns.
2
Understanding `volatile`: Visibility, Ordering, and When to Use It
Explain the `volatile` keyword, its visibility and ordering guarantees, and when it is sufficient versus when locks are needed.
Memory Reordering in Multithreaded Code
Demonstrate with a code example how compiler, JIT, or CPU instruction reordering can lead to incorrect behavior in a multithreaded context.
4
Understanding Happens-Before: Constraints for Predictable Outcomes
Describe the happens-before relationship and its key rules, explaining how they constrain reordering to guarantee predictable outcomes.
5
Cache Coherence & Java Memory Visibility
Explain at a high level how CPU cache coherence protocols relate to memory visibility issues in Java.
6
Final Fields and Safe Publication
Describe the memory visibility guarantees provided by `final` fields for safe object publication.
Previous module
Concurrency Primitives and Patterns
Next module
Reflection and Dynamic Proxies