检测多线程何时完成的正确方法- Java

Thread thread1 = new Thread(new Runnable() {
    @Override
    public void run() {
        // 线程1的任务
    }
});

Thread thread2 = new Thread(new Runnable() {
    @Override
    public void run() {
        // 线程2的任务
    }
});

thread1.start();
thread2.start();

try {
    thread1.join();
    thread2.join();
    // 在这里可以确保线程1和线程2都执行完成
} catch (InterruptedException e) {
    e.printStackTrace();
}

import java.util.concurrent.CountDownLatch;

public class Main {
    public static void main(String[] args) {
        int threadCount = 2;
        CountDownLatch latch = new CountDownLatch(threadCount);

        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                // 线程1的任务
                latch.countDown();
            }
        });

        Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                // 线程2的任务
                latch.countDown();
            }
        });

        thread1.start();
        thread2.start();

        try {
            latch.await();
            // 在这里可以确保线程1和线程2都执行完成
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}