What does args in java do?

The args variable in Java is an array of command line arguments used to receive user input, configure program startup options, and communicate between programs. It is passed to the main method via the String[] args argument, which can be iterated over the arguments in the array to get each argument. If no command line arguments are provided, the args array will be empty.

The role of args in Java

The args variable in Java programming language is a An array of command line arguments that contains the command line arguments passed to a Java program when it runs.

Uses:

args Variables are mainly used for:

• Accept parameters input by users through the command line interface
• Handles configuration options or other information when the program is started
• Provides a method of communication between the program and a script or other external program

Usage:

In the main method of the Java program, the args variable is a string array:

<code class="java">public static void main(String[] args) {
    // 使用 args 数组中的参数
}</code>

can be traversed args Array to access each argument:

<code class="java">for (String arg : args) {
    // 处理每个参数
}</code>

Example:

The following is an example of accepting user input using an array of args:

<code class="java">public static void main(String[] args) {
    if (args.length == 0) {
        System.out.println("请提供一个参数。");
    } else {
        String parameter = args[0];
        // 使用参数 parameter
    }
}</code>

Note:

• args Arguments in the array are passed as strings and need to be converted as needed.
• If no command line arguments are passed to the program, the args array will be empty.

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