What does args mean in java

args is a special parameter array of the main method in Java, used to obtain a string array of command line parameters or external input. By accessing the args array, the program can read these arguments and process them as needed.

args in Java

What are args?

args is a special parameter of the main method in Java, which represents a command line parameter or an array of strings input from the outside.

Purpose of args

The args array stores the arguments passed to a Java program on the command line. It is mainly used to obtain user input from the command line or pass other information to the program.

Structure of args

The args array is a string array, where each element corresponds to a command line argument. The first argument is stored in args[0], and so on.

Accessing args

To access the args array, you need to specify it in the signature of the main method. A typical signature for the main method looks like this:

public static void main(String[] args)

Example

The following example demonstrates how to get arguments from the command line and access them using the args array:

public static void main(String[] args) {
    if (args.length > 0) {
        // 获取第一个命令行参数
        String name = args[0];
        
        // 打印出名称
        System.out.println("Hello, " + name + "!");
    }
}

When running this program in the command line, you can pass a name as an argument and the program will print out the output with a greeting.

Note

• The size of the args array is variable, depending on the number of arguments passed to the program.
• If no parameters are passed to the program, the args array will be empty.

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