What does args mean in java

args stands for command line arguments in Java and is an array of strings containing the list of arguments passed to the program when it is started. It is only available in the main method, and its default value is an empty array, with each parameter accessible by index. args is used to receive and process command line arguments to configure or provide input data when a program is started.

The meaning of args in Java

In Java, args is a special Variable name used to represent command line parameters. It is an array of strings containing the list of arguments passed to the program when it is started.

Detailed description:

• Type: String array (String[])
• Purpose : Receive command line parameters
• Scope: Only available in main method
• Default value: if If no command line parameters are provided, it will be an empty array (String[] {})

Usage:

args can be used in main method, and use index to access each parameter. For example:

public static void main(String[] args) {
    if (args.length > 0) {
        String firstArgument = args[0];
        // 使用 firstArgument 进行操作
    }
}

Passing command line arguments:

Command line arguments can be passed by providing the arguments when running the program on the command line.

Example:

java MyClass arg1 arg2 arg3

This will create an args with three elements Array: ["arg1", "arg2", "arg3"].

Note: The parameters contained in

• args are the original values ​​of strings, and they need to be type converted as needed. The
• main method must be static because it can access args without creating an instance of the class.
• args can be used for various purposes such as configuration, input validation, and data processing.

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