principle Thread Pool Maintains a fixed-size pool of threads that are idle, waiting to process tasks. When a task is submitted to the thread pool, it allocates an idle thread to execute it. If all threads are busy, new tasks are put into the queue waiting to be executed.
Common parameters of the thread pool include:
practice
Create thread pool:
Thread pools can be created through the Executors
class and support different types of thread pools, such as:
newFixedThreadPool(int)
: Create a thread pool with a fixed size. newCachedThreadPool()
: Dynamically create threads as needed, with no limit on the maximum number of threads. newScheduledThreadPool(int)
: Create a thread pool that can schedule delayed or periodic tasks. Submit task:
Tasks can be submitted to the thread pool through the submit()
or execute()
method of the ExecutorService
interface. The former returns a Future
object, which can be used to obtain task execution results or check its status.
Manage thread pool:
Thread pool managers (such as ThreadPoolExecutor
) provide various methods to manage thread pools, including:
Best Practices
Integer.MAX_VALUE
) may cause memory overflow. Summarize The Java thread pool is a powerful mechanism that improves application performance, scalability, and resource utilization by managing and reusing threads. By understanding the principles and best practices of thread pools, developers can effectively use them to optimize applications and improve concurrency performance.
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