Download the IronMQ jar. Or build from source with Apache Buildr:
buildr package
The .jar file will appear under the target directory.
The API is documented here.
Initialize a client and get a queue object:
Client client = new Client("my project", "my token");
Queue queue = client.queue("my_queue");
Push a message on the queue:
queue.Push("Hello, world!");
Pop a message off the queue:
Message msg = queue.get();
When you pop/get a message from the queue, it will not be deleted. It will eventually go back onto the queue after a timeout if you don't delete it. (The default timeout is 10 minutes.)
Delete a message from the queue:
queue.deleteMessage(msg);