java写命令行工具

journey
    title How to Implement a Command Line Tool in Java

    section Steps
        Start --> Define Command Line Interface: "Define the command line interface for the tool"
        Define Command Line Interface --> Parse Input: "Parse the input arguments provided by the user"
        Parse Input --> Implement Logic: "Implement the business logic of the tool"
        Implement Logic --> Display Output: "Display the output to the user"

    section Code Snippets
        Define Command Line Interface 
        Parse Input 
        Implement Logic 
        Display Output 

sequenceDiagram
    participant Developer
    participant Newbie

    Developer->>Newbie: Define the command line interface
    Developer->>Newbie: Parse the input arguments
    Developer->>Newbie: Implement the business logic
    Developer->>Newbie: Display the output

作为一名经验丰富的开发者，你可以通过以下步骤教会新人如何实现“java写命令行工具”：

1. **定义命令行接口（Define Command Line Interface）**：

// Define the command line interface using Apache Commons CLI
Options options = new Options();
options.addOption("h", "help", false, "Print help message");
options.addOption("f", "file", true, "Specify input file");

2. **解析输入（Parse Input）**：

// Parse the input arguments provided by the user
CommandLineParser parser = new DefaultParser();
CommandLine cmd = parser.parse(options, args);

if (cmd.hasOption("h")) {
    // Print help message
} else {
    String inputFile = cmd.getOptionValue("f");
}

3. **实现逻辑（Implement Logic）**：

// Implement the business logic of the tool
File file = new File(inputFile);
// Read data from file and process it

4. **显示输出（Display Output）**：

// Display the output to the user
System.out.println("Output message");

通过以上步骤，新人可以完成一个简单的命令行工具的实现。希望这篇文章对你有所帮助，祝你在学习和工作中取得更大的进步！