Not all of this code is new. In fact, we have either used most of it before or discussed it earlier in the chapter. However, I wanted to present every line to you in order and in context with at least a brief explanation, even when we have seen it before. Having said that, I haven't included the long list of imports as we will either be prompted to add them automatically or we can just press Alt + Enter when needed.

This way, we can remind ourselves how the whole thing comes together without any blanks in our understanding. As usual, I will summarize as we proceed through the implementation, and go into a few bits of extra depth at the end: