Detailed explanation

JCOMMANDER is a Java library for handling command line parameters.It provides a simple and powerful way to define and analyze command line parameters, and it is easy to integrate into any Java application. 1. JCOMMANDER parameter type: JCOMMANDER supports various types of parameters, as shown below: 1. Basic data types: JCOMMANDER supports the basic data types of Java, such as int, float, Boolean, etc. 2. String type: JCOMMANDER can handle string parameters and provide verification and processing options for string. 3. Like type: JCOMMANDER supports enumeration type parameters, which can easily select enumeration values. 4. Custom type: JCOMMANDER can also process custom types to analyze and verify parameters by implementing custom converters. 5. Collection type: JCOMMANDER can handle the collection type parameters, such as list, set, etc. 2. How to use JCOMMANDER: The following is the general step of using JCOMMANDER to process command line parameters: 1. Create a Java class containing parameters, and use the JCOMMANDER annotation to add description and verification rules as parameters.For example, you can use the @Parameter annotation to define the parameter name, describe and verify the rules. public class CommandLineArgs { @Parameter(names = {"--name", "-n"}, description = "Name of the user", required = true) String name; @Parameter(names = {"--age", "-a"}, description = "Age of the user", required = true) int age; } 2. Create a JCOMMANDER object in the Java application and associate it with the instance of the above parameter class. CommandLineArgs args = new CommandLineArgs(); JCommander jCommander = JCommander.newBuilder() .addObject(args) .build(); 3. Analyze the command line parameters.You can use the JCOMMANDER.PARSE () method to parse the command line parameters and set them to the instance of the parameter class. jCommander.parse(argsArray); 4. Use the parameter value.Once the parameters are successfully parsed and set to instances of the parameter class, these parameters can be used in the program. System.out.println("Name: " + args.name); System.out.println("Age: " + args.age); This is a simple example of using JCOMMANDER to process command line parameters: import com.beust.jcommander.JCommander; import com.beust.jcommander.Parameter; public class CommandLineArgs { @Parameter(names = {"--name", "-n"}, description = "Name of the user", required = true) String name; @Parameter(names = {"--age", "-a"}, description = "Age of the user", required = true) int age; public static void main(String[] args) { CommandLineArgs cmdArgs = new CommandLineArgs(); JCommander jCommander = JCommander.newBuilder() .addObject(cmdArgs) .build(); jCommander.parse(args); System.out.println("Name: " + cmdArgs.name); System.out.println("Age: " + cmdArgs.age); } } In the above example, when the Java program is executed, the value of the parameter can be set by the command line input similar to the command line input of the command line input similar to the `java commamandlineargs -n -a 25`.The JCOMMANDER library will be responsible for analyzing these parameters and setting them into instances of related parameter classes."Name: John" and "Age: 25" were printed separately. Summarize: This article introduces the parameter type and how to use JCOMMANDER.By using the JCOMMANDER library, you can easily define and analyze the command line parameters and integrate it into the Java application.I hope this article can help readers better understand and use the JCOMMANDER library.