Uses of Interface
java.util.concurrent.Executor

Packages that use Executor 
Package Description
com.sun.net.httpserver
Provides a simple high-level Http server API, which can be used to build embedded HTTP servers.
java.net.http
HTTP Client and WebSocket APIs
java.sql
Provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java™ programming language.
java.util.concurrent
Utility classes commonly useful in concurrent programming.
javax.management
Provides the core classes for the Java Management Extensions.