Purpose
1. Install the alibaba plug-in to solve the specification problem in the code. Study the Code menu again and find a feature that feels best to you.
2. Add your learning partner to your project on the code cloud, download the Complex code of partner experiment 2, add no less than three JUnit unit test cases, test and upload the code to the code cloud
3. Complete the refactoring exercises, download the code of your partner, perform at least three refactorings, submit a screenshot of the refactored code, and add your own student number watermark. Submit your partner's code cloud project link
Fourth, combine refactoring, git, and code standards to complete the learning of Java cryptography related content in pairs.