What do you mean by CountDownLatch in java?

Problem statement:

• Class CountDownLatch:

1. java.util.concurrent
2. java.util.concurrent.CountDownLatch extends java.lang.Object
3. Since Java 1.5

• Constructor Summary:

1. CountDownLatch(int count)

Constructs a CountDownLatch initialized with the given count.

• Method Summary:

1. await(): void
2. await(long timeout, TimeUnit unit): boolean
3. countDown(): void
4. getCount(): long
5. toString(): String