What is the `ConcurrentHashMap` and how does it provide thread safety with good performance?
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java what is synchronized Informational
- How does a thread acquire a monitor lock in Java? What happens to other threads trying to access a synchronized method or block when one thread holds the lock?
- What are the trade-offs between different approaches to achieving thread safety in terms of performance, complexity, and maintainability? How does exception handling interact with thread safety in synchronized code?
- How does thread safety relate to the scalability of concurrent Java applications? What are some design patterns that help in building thread-safe Java components?
- What are the four necessary conditions for a deadlock to occur? Can you provide an example of a deadlock scenario involving the `synchronized` keyword?
- What is biased locking in the JVM and how does it optimize synchronization for single-threaded scenarios?
- What are some use cases for `ConcurrentHashMap`? What is the `CopyOnWriteArrayList` in Java and when is it suitable for use?
- What are some common pitfalls related to the JMM that can lead to subtle concurrency bugs in Java?
- How does the concept of atomicity at the hardware level relate to thread safety in Java? What are compare-and-swap (CAS) operations and how are they used to build thread-safe constructs without explicit locking?
- What are futures and callables and how can they be used to work with the results of concurrent tasks? What is the Fork/Join framework in Java and how does it handle parallel tasks and potential synchronization needs?
- What are concurrent data structures and why are they important in multithreaded Java programming? How do thread-safe collections (e.g., from `java.util.concurrent`) differ from standard collections in terms of synchronization?
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