At last we have used some serious Java. We learned about variables, declaration, and initialization. We saw how to use operators to change the value of variables, we used if, else, and switch to make decisions with expressions and branch our code. We saw and practiced while, for, and do while to repeat parts of our code.

It doesn't matter if you don't remember everything straight away as we will constantly be using these techniques and keywords throughout the book.

Next, we will take a much closer look at Java methods, which is where all our code will go.