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POHow do I use this? public <R extends IPCMessage> R sendAndGetResponse(IPCMessage msg)
 

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  1. POHow do I use this? public <R extends IPCMessage> R sendAndGetResponse(IPCMessage msg)
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    <p>I've been writing Java swing GUI code for several years but the following syntax stumps me. I'm talking about the " &lt; R extends IPCMessage > R" portion of the method below. I found this in a library another engineer wrote and I have no idea how to use it. </p> <p>I'm very familiar with the other uses of generics but this one I don't know. </p> <p>Can someone explain what is going on and how I can use it?</p> <p>Thank you.</p> <pre><code>/** * Sends the specified IPC message to the process the IPC instance is * connected to * * @param msg * the IPC message to send * @return IPCMessageRx for the received response message if want_resp is * true null if want_resp is true and no response was received * within the timeout null if want_resp is false * @throws InvalidCastException if the return type doesn't match the actual * type of the response. */ @SuppressWarnings("unchecked") public &lt;R extends IPCMessage&gt; R sendAndGetResponse(IPCMessage msg) { logger.logTrace("IPClient::sendAndGetResponse: entered, msg = \"" + msg.toString() + "\""); // keep track of whether the message sent boolean msg_sent = send(msg); // if the message sent and a response is wanted, try to get one from the // received message buffer IPCMessage back = null; if (msg_sent == true) { back = receive(msg.getSequenceNumber()); } if (back == null) { logger.logDebug("IPClient::send: exiting, back = null"); } else { logger.logTrace("IPCClient::send: exiting, back != null"); } return (R)back; } </code></pre>
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