24  */

    24  */

    25 package java.net;

    25 package java.net;

    26 

    26 

    27 import java.io.FileDescriptor;

    27 import java.io.FileDescriptor;

    28 import java.io.IOException;

    28 import java.io.IOException;

    31 import sun.net.ResourceManager;

    29 import sun.net.ResourceManager;

    32 

    30 

    33 /**

    31 /**

    34  * Abstract datagram and multicast socket implementation base class.

    32  * Abstract datagram and multicast socket implementation base class.

    35  * Note: This is not a public class, so that applets cannot call

    33  * Note: This is not a public class, so that applets cannot call

   151 

   149 

   152     /**

   150     /**

   153      * Set the TTL (time-to-live) option.

   151      * Set the TTL (time-to-live) option.

   154      * @param TTL to be set.

   152      * @param TTL to be set.

   155      */

   153      */

   156     protected abstract void setTTL(byte ttl) throws IOException;

   155     protected abstract void setTTL(byte ttl) throws IOException;

   157 

   156 

   158     /**

   157     /**

   159      * Get the TTL (time-to-live) option.

   158      * Get the TTL (time-to-live) option.

   160      */

   159      */

   161     protected abstract byte getTTL() throws IOException;

   161     protected abstract byte getTTL() throws IOException;

   162 

   162 

   163     /**

   163     /**

   164      * Join the multicast group.

   164      * Join the multicast group.

   165      * @param multicast address to join.

   165      * @param multicast address to join.