| 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. | 
| Modifier and Type | Method and 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  blockmethod. | 
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