跟踪多线程java程序的总执行时间

public class Main {
    public static void main(String[] args) {
        long startTime = System.currentTimeMillis();

        // 创建并启动多个线程
        Thread thread1 = new Thread(new MyRunnable());
        Thread thread2 = new Thread(new MyRunnable());
        thread1.start();
        thread2.start();

        // 等待所有线程执行完成
        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        long endTime = System.currentTimeMillis();
        long totalTime = endTime - startTime;

        System.out.println("总执行时间：" + totalTime + "毫秒");
    }

    static class MyRunnable implements Runnable {
        @Override
        public void run() {
            // 执行需要跟踪执行时间的任务
            // ...
        }
    }
}