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The first usecase we are going to take a look at, is about the queue. There are trivial ones like a playlist, where you can add more music to. Another common usecase is the breadth first search for a tree traversal. But we are going to look at a more general concept.
Imagine you have some code, which produces some data and another part, which processes the data. This doesn't necessarily have to be in sync. Specially when you talk about different threads or processes. You then need a way to buffer the incomming data, otherwise you would overwrite the oldes one, which, depending on the circumstances, can lead to errors. A queue helps to get around this problem.
For this exercise we prepared a thread, which just produces some random numbers and pushes them on a queue. Your task is to add the oldest two together and print them out.