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Java Multithreading Interview Questions and Answers

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Ques 21. Explain the concept of thread dumping.

Thread dumping involves generating a snapshot of all the threads' current state and stack traces. It is useful for diagnosing performance or deadlock issues.

Example:

In Java, you can use tools like jstack or VisualVM to generate thread dumps.

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Ques 22. How does the ConcurrentHashMap differ from HashMap in terms of multithreading?

ConcurrentHashMap is designed for multithreaded access and allows concurrent reads without blocking, while HashMap is not thread-safe and may lead to inconsistencies in a multithreaded environment.

Example:

ConcurrentMap concurrentMap = new ConcurrentHashMap<>();

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Ques 23. Explain the concept of the happens-before relationship in Java.

The happens-before relationship is a partial ordering of memory operations in Java. It ensures that the result of one operation is visible to another, providing a consistent view of shared data among threads.

Example:

Using synchronized blocks establishes a happens-before relationship.

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Ques 24. What is the purpose of the AtomicInteger class in Java?

AtomicInteger is a class in Java that provides atomic operations for integer variables, ensuring that operations on the variable are performed atomically without interference from other threads.

Example:

AtomicInteger counter = new AtomicInteger(0); counter.incrementAndGet();

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Ques 25. Explain the concept of thread starvation.

Thread starvation occurs when a thread is unable to gain access to a resource or the CPU, preventing it from making progress. It is often caused by improper synchronization or priority mismanagement.

Example:

When low-priority threads continuously preempt high-priority threads.

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