Add JavaDoc for inbox and delete commands

src/main/java/dslab/client/MessageClient.java

@@ -323,6 +323,14 @@ public class MessageClient implements IMessageClient, Runnable {
         return (Base64.getEncoder().encodeToString(cipherTextChallenge));
     }
 
+    /**
+     * Queries the MailboxServer for messages sent to a user.
+     * <p>
+     * Sends the 'list' command to the MailboxServer. From the output
+     * the IDs of the messages are extracted. For every ID, the 'show'
+     * command is sent to the MailboxServer and then printed to the
+     * shell.
+     */
     @Command
     @Override
     public void inbox() {
@@ -356,6 +364,11 @@ public class MessageClient implements IMessageClient, Runnable {
         }
     }
 
+    /**
+     * Deletes a message with the given ID from the MailboxServer.
+     *
+     * @param id The ID of the message that should be deleted.
+     */
     @Command
     @Override
     public void delete(String id) {
@@ -443,6 +456,16 @@ public class MessageClient implements IMessageClient, Runnable {
         }
     }
 
+    /**
+     * Takes a message from the command line and sends it to the TransferServer.
+     * <p>
+     * The message is replayed to the TransferServer via the DMTP2.0
+     * protocol and a hash of the message is calculated and appended.
+     *
+     * @param to      comma separated list of recipients
+     * @param subject the message subject
+     * @param data    the message data
+     */
     @Command
     @Override
     public void msg(String to, String subject, String data) {
@@ -530,6 +553,9 @@ public class MessageClient implements IMessageClient, Runnable {
         }
     }
 
+    /**
+     * Shuts down the MessageClient.
+     */
     @Command
     @Override
     public void shutdown() {