what is java thread pool

There are many benefits of using a thread pool, such as saving the cost of system resources, saving time to create and destroy threads, etc. When we need to process more tasks, we can use the thread pool , there may be many users who don’t know how to use Java thread pool? Today I will share with you how to use the four thread pools in Java.

Thread pool introduction:

The thread pool is a form of multi-thread processing. Tasks are added to the queue during processing, and then automatically after the thread is created. Start these tasks. Thread pool threads are background threads. Each thread uses the default stack size, runs at the default priority, and is in a multi-threaded apartment. If a thread is idle in managed code (such as waiting for an event), the thread pool will insert another worker thread to keep all processors busy. If all thread pool threads remain busy at all times, but the queue contains pending work, the thread pool will create another worker thread after a while but the number of threads will never exceed the maximum. Threads that exceed the maximum can be queued, but they are not started until other threads have finished.

The use of four thread pools in Java:

Java provides four thread pools through Executors, which are:

newCachedThreadPool creates a cacheable thread pool. If the length of the thread pool exceeds processing needs, idle threads can be flexibly recycled. If there is no way to recycle, a new thread will be created.

newFixedThreadPool creates a fixed-length thread pool that can control the maximum number of concurrent threads. Exceeding threads will wait in the queue.

newScheduledThreadPool creates a fixed-length thread pool that supports scheduled and periodic task execution.

newSingleThreadExecutor creates a single-threaded thread pool, which will only use the only working thread to execute tasks, ensuring that all tasks are executed in the specified order (FIFO, LIFO, priority).

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