Uses of Class

Packages that use Void
Provides classes that are fundamental to the design of the Java programming language.
HTTP Client and WebSocket APIs
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.
Utility classes commonly useful in concurrent programming.
Provides the open data types and Open MBean descriptor classes.