Java project, creating a cli

This article shares my experience in developing an command line interface (CLI) project in recent days.

This year I intend to study Java in depth. After completing the challenges of some ADVENT of Code and conducting some conventional exercises, I decided to start creating a small project to understand this language more deeply and closer to the overall development process of Java applications.

Let's start!

Project content

I am building a simple CLI application, which simulates three UNIX system commands:

,

and ls. The reasons for choosing these three commands are as follows: mv ifconfig

I want to handle files.

1. I want to know the bottom implementation of .
2. ifconfig Project Construction
My first step is to try to use a tool to manage all my code. After searching for fast search, I found that Maven was one of the options for this task in the Java ecosystem. Therefore, I quickly operated according to the basic entry guide in the document and obtained the project's skeleton.

Then I spent some time trying to figure out how to test in Java in Java. However, after a while, I found that testing CLI is more difficult, partly because I lack experience in the entire ecosystem, especially the CLI field.

In order to overcome this problem, my decision is very simple: first focus on building orders, and then as I understand the Java and its ecosystem, I will return and add it to the project.

Create Command

The first command I created was

. To be honest, the first thing I did was to ask how ChatGPT was achieved in Java. I originally thought that according to my experience in JavaScript, I would use the class and methods in IO (FS in JavaScript). I have never thought that There is a built -in method in the class that can list the files in the directory, and in order to implement this function, we need to use the

option to create a new ls instance:

ls I also added a simple text to indicate whether the file is a folder, a hidden file or a common file. File . Create Command File

The process of creating this command is roughly the same as the

File directory = new File(".");
File[] files = directory.listFiles();

command. The main difference is that I first created a simple function to move specific files, and then added the function of passing two parameters (original paths and target paths).

Create Command

mv When creating this command, I followed the same process as the previous two commands. I asked ChatGPT to generate the basic code of the command, and then add more steps to the results I provided to ChatGPT, or check the Java document to understand the class used in the command. For example, here I know more information about bags, and how to use the package and

.

ls The overall overview of how to use the package and

.

Conclusion

I think in the next project, I will focus on other aspects to better understand Java. For example, the next project is a simple example of using JDBC to connect to the database.

The following is the code of the Junix project (the code is omitted here).

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