Uses of Interface java.util.concurrent.CompletionService (Java SE 9 & JDK 9 )

## Uses of Interface
java.util.concurrent.CompletionService

- Packages that use CompletionService
  Package | Description
  --- | ---
  java.util.concurrent | Utility classes commonly useful in concurrent programming.

- - ### Uses of CompletionService in java.util.concurrent

    Classes in java.util.concurrent that implement CompletionService
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `ExecutorCompletionService<V>` | A `CompletionService` that uses a supplied `Executor` to execute tasks.