Share practical experience: Java thread pool creation method selection tips

Practical experience sharing: How to choose the appropriate Java thread pool creation method requires specific code examples

In multi-threaded programming, thread pools are a commonly used technology. It can effectively manage thread resources and improve program performance and stability. Java's thread pool is implemented through the ThreadPoolExecutor class, but in actual use, we need to choose an appropriate thread pool creation method based on specific needs. This article will introduce several common thread pool creation methods and provide corresponding code examples for reference.

1. FixedThreadPool fixed-size thread pool
   FixedThreadPool is a fixed-size thread pool. The number of threads it creates is fixed. When all threads in the thread pool are executing tasks, new ones will The task must wait. Suitable for processing CPU-intensive tasks.

The sample code is as follows:

ExecutorService executor = Executors.newFixedThreadPool(5);
for (int i = 0; i < 10; i++) {
    executor.execute(new MyTask(i));
}
executor.shutdown();

2. CachedThreadPool cache thread pool
   CachedThreadPool is an unlimited size thread pool suitable for processing a large number of short-term tasks. The size of the thread pool will be automatically adjusted based on actual demand. If free threads are available, they are reused; if no threads are available, new threads are created.

The sample code is as follows:

ExecutorService executor = Executors.newCachedThreadPool();
for (int i = 0; i < 10; i++) {
    executor.execute(new MyTask(i));
}
executor.shutdown();

3. SingleThreadExecutor single-threaded thread pool
   SingleThreadExecutor is a single-threaded thread pool, which is suitable for tasks that need to ensure that tasks are executed in order Scenes. All tasks will be executed sequentially in the same thread.

The sample code is as follows:

ExecutorService executor = Executors.newSingleThreadExecutor();
for (int i = 0; i < 10; i++) {
    executor.execute(new MyTask(i));
}
executor.shutdown();

4. ScheduledThreadPool scheduled task thread pool
   ScheduledThreadPool is a thread pool that can execute scheduled tasks. You can specify the time and time of task execution. interval. Suitable for scenarios that require scheduled execution of tasks.

The sample code is as follows:

ScheduledExecutorService executor = Executors.newScheduledThreadPool(3);
executor.scheduleAtFixedRate(new MyTask(), 0, 1, TimeUnit.SECONDS);
// 延迟5秒执行
executor.schedule(new MyTask(), 5, TimeUnit.SECONDS);
executor.shutdown();

When choosing a thread pool creation method, you need to make a judgment based on actual needs. If you need to process a large number of short-term tasks, you can choose CachedThreadPool; if you need to ensure that tasks are executed in order, you can choose SingleThreadExecutor; if you need to execute tasks regularly, you can choose ScheduledThreadPool. If the number of tasks is fixed and you need to control the number of threads, you can choose FixedThreadPool.

Summary:
Through the introduction of this article, we have learned about several commonly used Java thread pool creation methods and provided corresponding code examples. In actual development, choosing an appropriate thread pool according to specific needs will help improve the performance and stability of the program. I hope this article can help you choose how to create a thread pool.

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