# Uses of Class
java.nio.channels.MembershipKey

Packages that use MembershipKey
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.

- ## Uses of MembershipKey in java.nio.channels

  Methods in java.nio.channels that return MembershipKey
  Modifier and Type
  Method
  Description
  `abstract MembershipKey`
  MembershipKey.`block(InetAddress source)`
  Block multicast datagrams from the given source address.
  `MembershipKey`
  MulticastChannel.`join(InetAddress group, NetworkInterface interf)`
  Joins a multicast group to begin receiving all datagrams sent to the group, returning a membership key.
  `MembershipKey`
  MulticastChannel.`join(InetAddress group, NetworkInterface interf, InetAddress source)`
  Joins a multicast group to begin receiving datagrams sent to the group from a given source address.
  `abstract MembershipKey`
  MembershipKey.`unblock(InetAddress source)`
  Unblock multicast datagrams from the given source address that was previously blocked using the `block` method.