Practice with Strings

Java

Created By: Geoffrey Challen

/ Updated: 2022-05-26

Welcome back! Our next lesson is entirely focused on one problem: encryption.

We're going to modify the normal lesson flow. We'll start with the homework problem at the top. If you'd like to just go at on your own, go for it! And, if you'd like a bit of help, we'll break it down piece-by-piece below.

Let's get to it!

Rot-13 Part 0: Understanding the Problem

Let's break down this problem into smaller pieces, and spend a few moments just orienting ourselves and figuring out what to do. We won't write test cases yet, and instead save them for the smaller pieces that we're about to create.

Rot-13 Part 1: Character Mapping

Now that we have a sense of what the different pieces are, let's look at one of the core challenges: remapping each character. We'll also write some simple test cases for our helper method.

Rot-13 Part 2: Breaking Down the String

At this point we've identified how to remap individual characters. Next we need to review how to break the input String into individual characters.

Rot-13 Part 3: Putting it All Together

Now that we have our building blocks, let's integrate everything together!

More Practice

If you are enjoying Strings, rotation, and modular arithmetic, and haven't had enough yet—here is a practice problem that you might enjoy!