Refactoring Java with IntelliJ IDEA

We take a short your of our example codebase, and learn about the classes that we'll be refactoring.

As IntelliJ IDEA is so configurable, it can be difficult to align settings between different users. Here we learn how to configure the settings that were used on this course.

IntelliJ has some pretty cool in-built refactorings for specific situations. Here we learn how to use one of them.

A discussion about refactoring - why should anybody even bother?

Here we see that you don't really even need to type any code to effect some major changes to a codebase. We can find and fix bugs almost without trying.

Here we learn how to use IntelliJ IDEA's "Extract Variable" and "Extract Method" refactorings. There are some surprising quirks in how they work - It's not as obvious as it might seem!

Rename methods, variables and all manner of other symbols across a codebase in fractions of a second. Here we see how.

Functionality can be lying around all over the place. Here we use the "Extract Method" refactoring to clean it up and put it in the right place.

Continuing to tidy up, this time moving methods between classes.

We make extensive use of the "Intention Menu" as we continue to tidy up the code.

We add some tests, with some surprising and unexpected consequences.

In this lecture we up the ante with the refactoring, using "Extract Interface, and add just a small extra feature to the system.

The business owners have a far more complex feature to add to our system. Here we find out if our previous refactorings have made it easier or harder. We write some acceptance tests, and attempt to implement our feature before lunchtime.

Some closing thoughts about IntelliJ IDEA and refactoring in general.