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Updated on 2025-05-16

An example of Java multithreaded concurrent JUC package CountDownLatch locking

An example of Java multithreaded concurrent JUC package CountDownLatch locking

Updated: May 16, 2025 10:42:16 Author: Erliuba
This article mainly introduces the example of Java multithreaded concurrent JUC package CountDownLatch locking, which has good reference value. I hope it will be helpful to everyone. If there are any errors or no complete considerations, I hope you will be very encouraged.

Java multithreaded concurrent JUC package CountDownLatch lock

Locking is a disposable object

Once it enters the termination state, it cannot be reset.

public class CountDownLatchDemo {

    public static void main(String[] args) throws InterruptedException {
        int count = 5;
        CountDownLatch countDownLatch = new CountDownLatch(count);
        for (int i = 0; i < count; i++) {
            new Tangerine((i),countDownLatch).start();
        }
        ("main thread waiting\n");
        ();
        ("Main thread ends running");
    }

    static class Tangerine extends Thread {
        final CountDownLatch countDownLatch;
        public Tangerine(String name,CountDownLatch countDownLatch) {
            super(name);
             = countDownLatch;
        }

        @Override
        public void run() {
            ("Thread %s is running\n", ());
            ();
        }
    }
}
  • await()Wait until the value in the counter decreases to 0.
  • await(long timeout, TimeUnit unit)You can set the timeout time yourself. Once this time exceeds, the await thread will be awakened. If true returns, it means that the counter is 0, otherwise, it will not be 0.
  • countDown()Decrement the counter value by 1.
  • getCount()Get the value of the current counter.

Summarize

The above is personal experience. I hope you can give you a reference and I hope you can support me more.

  • Java
  • Multi-threaded concurrency
  • JUC package
  • CountDownLatch
  • atresia

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