In-depth discussion: Four ways to create a Java thread pool

From entry to proficiency: Full analysis of the four creation methods of Java thread pool

Introduction:
Java thread pool is a very important multi-thread processing tool , can improve the performance and stability of the program. In daily development, using a thread pool can better manage the life cycle of threads and avoid frequent creation and destruction of threads. This article will comprehensively analyze the four ways to create a Java thread pool and provide specific code examples to help readers deeply understand and master the usage skills of thread pools.

1. FixedThreadPool (fixed-size thread pool)
FixedThreadPool is a fixed-size thread pool. It will create a certain number of threads during initialization, and when a thread completes its task, it will immediately Reuse it for new tasks. The following is a sample code for using FixedThreadPool to create a thread pool:

ExecutorService executor = Executors.newFixedThreadPool(5);
for (int i = 0; i < 10; i++) {
    Runnable worker = new WorkerThread("Task " + i);
    executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
    // 等待所有任务完成
}

2. CachedThreadPool (cacheable thread pool)
CachedThreadPool is a cacheable thread pool that dynamically creates and destroys threads as needed . If the number of threads in the thread pool exceeds the currently required number of threads, the excess threads will be destroyed. The following is an example code for using CachedThreadPool to create a thread pool:

ExecutorService executor = Executors.newCachedThreadPool();
for (int i = 0; i < 10; i++) {
    Runnable worker = new WorkerThread("Task " + i);
    executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
    // 等待所有任务完成
}

3. SingleThreadExecutor (single-threaded thread pool)
SingleThreadExecutor is a thread pool with only one thread. It will serialize tasks in the order in which they are submitted. Perform all tasks. This kind of thread pool is suitable for scenarios where tasks need to be executed sequentially. The following is an example code for using SingleThreadExecutor to create a thread pool:

ExecutorService executor = Executors.newSingleThreadExecutor();
for (int i = 0; i < 10; i++) {
    Runnable worker = new WorkerThread("Task " + i);
    executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
    // 等待所有任务完成
}

4. ScheduledThreadPool (timing scheduling thread pool)
ScheduledThreadPool is a regularly scheduled thread pool used to execute scheduled tasks and periodic tasks. You can set the delay time and period of the task, and specify the execution interval of the task. The following is sample code for using ScheduledThreadPool to create a thread pool:

ScheduledExecutorService executor = Executors.newScheduledThreadPool(5);
Runnable worker = new WorkerThread();
executor.schedule(worker, 5, TimeUnit.SECONDS); // 5秒后执行任务
executor.scheduleAtFixedRate(worker, 0, 10, TimeUnit.SECONDS); // 每10秒重复执行任务
executor.shutdown();
while (!executor.isTerminated()) {
    // 等待所有任务完成
}

Summary:
This article details the four ways to create a Java thread pool and provides specific code examples. By using the thread pool, thread resources can be better managed and utilized, and the performance and stability of the program can be improved. Readers can choose the appropriate thread pool type according to specific needs and make practical applications based on the sample code. Mastering the skills of using thread pools is very important for developing efficient and stable multi-threaded applications. I hope this article will be helpful to readers, allowing everyone to use Java thread pools from entry to proficiency.

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