Uses of Interface
java.util.concurrent.ExecutorService

Packages that use ExecutorService 
Package Description
java.nio.channels
Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.
java.nio.channels.spi
Service-provider classes for the java.nio.channels package.
java.nio.file.spi
Service-provider classes for the java.nio.file package.
java.util.concurrent
Utility classes commonly useful in concurrent programming.