如何将多个线程同步到公共点

public class SynchronizedExample {
    public void synchronizedMethod() {
        synchronized (this) {
            // 同步代码块
        }
    }
}

import java.util.concurrent.CountDownLatch;

public class CountDownLatchExample {
    public void countDownLatchMethod() throws InterruptedException {
        int threadCount = 10;
        CountDownLatch countDownLatch = new CountDownLatch(threadCount);

        for (int i = 0; i< threadCount; i++) {
            new Thread(() -> {
                // 执行线程任务
                countDownLatch.countDown();
            }).start();
        }

        countDownLatch.await(); // 等待所有线程执行完毕
        // 继续执行主线程任务
    }
}

import java.util.concurrent.CyclicBarrier;

public class CyclicBarrierExample {
    public void cyclicBarrierMethod() throws InterruptedException {
        int threadCount = 10;
        CyclicBarrier cyclicBarrier = new CyclicBarrier(threadCount, () -> {
            // 所有线程到达屏障后执行的任务
        });

        for (int i = 0; i< threadCount; i++) {
            new Thread(() -> {
                // 执行线程任务
                try {
                    cyclicBarrier.await(); // 等待所有线程到达屏障
                } catch (InterruptedException | BrokenBarrierException e) {
                    e.printStackTrace();
                }
            }).start();
        }
    }
}

import java.util.concurrent.Semaphore;

public class SemaphoreExample {
    public void semaphoreMethod() throws InterruptedException {
        int threadCount = 10;
        Semaphore semaphore = new Semaphore(threadCount);

        for (int i = 0; i< threadCount; i++) {
            new Thread(() -> {
                try {
                    semaphore.acquire(); // 获取许可
                    // 执行线程任务
                    semaphore.release(); // 释放许可
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }).start();
        }
    }
}