The article directories

  • One, foreword
  • CountDownLatch overview
  • Third, CountDownLatch source code analysis
  • General example of CountDownLatch (methods involved: constructor, countDown, await)
  • CountDownLatch concurrency example (methods involved: constructor, countDown, await)
  • 6. Interview Goldfinger
    • 6.1 CountDownLatch
    • 6.2 Interview question: How to control the output of 10 threads from 1 to 10 in sequence?
  • Seven, the end

One, foreword

CountDownLatch was introduced in Java 1.5 and exists in the java.util.cucurrent package, It was introduced along with CyclicBarrier, Semaphore, concurrentHashMap, and BlockingQueue.

CountDownLatch overview

The CountDownLatch class causes a thread to wait for other threads to finish executing.

CountDownLatch operates in three steps

  1. Constructor &