Constructing Interactive Command Line Interfaces with CLI Framework in Java Class Libraries

Building an Interactive Command Line Interface Using the CLI Framework in Java Class Libraries Building an interactive command-line interface (CLI) is a very common and important task in Java development. The CLI interface allows users to interact with programs by entering commands from the command line, without relying on a graphical user interface (GUI). To simplify the process of building the CLI, Java developers can utilize the CLI framework provided in the Java class library. The CLI framework provides a set of APIs and tools for handling user input, parsing command parameters, and displaying help documents. The use of the CLI framework can greatly simplify the development process of the CLI interface and provide consistency and scalability. The following is an example of using the Apache Commons CLI framework to build an interactive command-line interface: import org.apache.commons.cli.*; public class MyCLI { public static void main(String[] args) { //Creating CLI Options Options options = new Options(); Options. addOption ("h", "help", false, "display help information"); Options. addOption ("v", "version", false, "display version information"); Options. addOption ("f", "file", true, "specify file path"); //Creating a Command Parser CommandLineParser parser = new DefaultParser(); try { //Parsing Command Line Parameters CommandLine cmd = parser.parse(options, args); //Check for help options if (cmd.hasOption("help")) { //Display Help Information HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("mycli", options); return; } //Check for version options if (cmd.hasOption("version")) { //Display version information System. out. println ("MyCLI version 1.0"); return; } //Check for file options if (cmd.hasOption("file")) { //Obtain the value of the file path parameter String filePath = cmd.getOptionValue("file"); //Perform corresponding operations using file paths System. out. println ("execute operation:"+filePath); } } catch (ParseException e) { System. out. println ("Error: Unable to parse command line parameters."); } } } In the above example, we created a CLI application using the Apache Commons CLI framework. We have defined three options: '- h' or '-- help' to display help information, '- v' or '-- version' to display version information, and '- f' or '-- file' to specify the file path. By parsing command line parameters, we can check the options selected by the user and perform the corresponding actions. If the user uses the '- h' or '-- help' option, help information will be displayed; If the '- v' or '-- version' options are used, version information will be displayed; If the '- f' or '-- file' option is used, obtain the value of the file path parameter and perform the corresponding operation. Using the CLI framework, it is easy to build a powerful and easy-to-use CLI interface, providing convenience and flexibility for users. Whether building command-line tools or interacting with users, using the CLI framework in the Java class library is an ideal choice. In summary, using the CLI framework in the Java class library can simplify the development process of the CLI interface. By defining options, parsing parameters, and performing corresponding operations, we can build interactive and feature-rich command-line applications.