jav threadpoolexecutor使用例子

好的，下面是一个使用 Java ThreadPoolExecutor 的例子：

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;

public class ThreadPoolExample {
    public static void main(String[] args) {
        // 创建线程池
        ExecutorService executor = Executors.newFixedThreadPool(5);

        // 执行任务
        for (int i = 1; i <= 10; i++) {
            Runnable worker = new WorkerThread("Task " + i);
            executor.execute(worker);
        }

        // 关闭线程池
        executor.shutdown();
        while (!executor.isTerminated()) {
        }

        System.out.println("Finished all tasks");
    }
}

class WorkerThread implements Runnable {
    private String task;

    public WorkerThread(String task) {
        this.task = task;
    }

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + " Start. Task = " + task);
        processTask();
        System.out.println(Thread.currentThread().getName() + " End.");
    }

    private void processTask() {
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    @Override
    public String toString() {
        return this.task;
    }
}

这个例子创建了一个固定大小的线程池，并执行了10个任务。每个任务是一个 WorkerThread 对象，它会打印一些信息并执行一些处理。在全部任务执行完成之后，线程池被关闭。