setInterface or setNetworkInterface. If there is a security manager, this method first calls its checkMulticast method with the mcastaddr argument as its argument.
@param mcastaddr is the multicast address to join
@exception IOException if there is an error joiningor when the address is not a multicast address.
@exception SecurityException if a security manager exists and its checkMulticast method doesn't allow the join.
@see SecurityManager#checkMulticast(InetAddress)
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