java thread interview questions and answers for experienced
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java threading is a critical topic for interviews, especially for experienced candidates. understanding threads, synchronization, concurrency, and related concepts is essential for demonstrating your proficiency in java. this tutorial will cover common java thread interview questions along with explanations and code examples.
1. what is a thread in java?
a thread is a lightweight process, and it is the smallest unit of processing that can be scheduled by an operating system. java provides built-in support for multithreading.
2. how to create a thread in java?
there are two primary ways to create a thread in java:
1. *by extending the `thread` class:*
2. *by implementing the `runnable` interface:*
3. what is the difference between `start()` and `run()` method?
`start()`: it is used to start the execution of the thread. when you call `start()`, a new thread is created, and the `run()` method is called by the new thread.
`run()`: it contains the code that defines what the thread will do when it is running. if you call `run()` directly, it will not create a new thread; it will execute it in the current thread.
4. what is the life cycle of a thread?
a thread can be in one of the following states:
**new**: a thread that is created but not yet started.
**runnable**: a thread that is ready to run and waiting for cpu time.
**blocked**: a thread that is waiting for a monitor lock.
**waiting**: a thread that is waiting indefinitely for another thread to perform a particular action.
**timed waiting**: a thread that is waiting for another thread to perform an action for a specified waiting time.
**terminated**: a thread that has completed its execution.
5. what is synchronization? why is it important?
synchronization is the process of controlling the access of multiple threads to shared resources. it is important because it helps prevent thread interference and memory consistency errors.
*example of synchronization:* ...
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