Welcome to the practical segment of our Java programming journey! Today, we'll apply the knowledge from past lessons to solve two practice problems using advanced Java data structures: queues, deques, and sorted maps with custom class keys.

Consider an event-driven system, like a restaurant. Orders arrive, and they must be handled in the order they were received, following the First In, First Out (FIFO) principle. This principle makes it a perfect scenario for a queue or deque implementation in Java.