The so-called Java thread pool is to put multiple threads in a pool (the so-called pooling technology), and then when a thread is needed, it does not create a thread, but obtains an available thread from the thread pool, and then executes our task. . The key to the thread pool is that it manages multiple threads for us, we don't need to care about how to create threads, we only need to concern our core business, and then get threads from the thread pool when we need threads to perform tasks. After the task is executed, the thread will not be destroyed, but will be put back into the pool, waiting for an opportunity to execute the task.
Why do we need thread pools? The first point is that the thread pool provides us with a simple multi-threaded programming solution. We don't need to invest too much energy to manage multiple threads. The thread pool will automatically manage it for us. It knows when to do things. We just need to get it when we need it. Secondly, our use of thread pools is largely due to the fact that creating and destroying threads is very expensive, and even the resources we create and destroy threads take longer than the tasks we actually perform, which is obviously not Science is also unreasonable, and if there is no reasonable manager, there may be too many threads created, that is, there are too many threads surviving in the JVM, and the surviving threads also need to destroy resources. At one point, too many threads can create an embarrassing situation of excessive thread switching.
After having a preliminary understanding of thread pools, let's take a look at how to use thread pools.
Combined with the latest knowledge of Java thread pools on the Internet, the video teaching explanation is implemented, so that you can better understand what is Java thread pool, the implementation principle of Java thread pool, and Java custom thread pool
Course Catalog:
Section 1 (The difference between blocking queue and concurrent queue)
Section 2 (ConcurrentLinkedDeque and BlockingQueue usage)
Section 3 (Thread pool overview)
Section 4 (Four ways to create thread pools)
Section 5 (Introduction to ThreadPoolExecutor parameters)
Section 6 (The principle of thread pool implementation)
Section 7 (custom thread pool)
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