What is the use of args in java

args in Java is a string array containing command line arguments, used to configure the program, pass data and script automation. Get the args through the main method and use a loop to process each argument, as in the example above to sum the numbers.

The purpose of args in Java

args in Java is a string array , which contains command line parameters, which are parameters passed in when running a Java program.

Usage scenarios

args Usually used in the following scenarios:

• Configuration program: Users can specify the runtime configuration parameters of the program through the command line, such as log level, input file path, etc.
• Passing data: Programs can take input data from the command line, such as calculating averages or searching for specific strings.
• Script Automation: args Can be used to write scripts that automate program operations, such as batch processing of files or running a specific test suite.

Get args

The Java program can get args through the main method:

<code class="java">public static void main(String[] args) {
    // 使用 args 数组获取命令行参数
}</code>

Example

The following is a simple example that calculates the sum of all numbers on the command line:

<code class="java">public static void main(String[] args) {
    int sum = 0;
    for (String arg : args) {
        try {
            int num = Integer.parseInt(arg);
            sum += num;
        } catch (NumberFormatException e) {
            // 忽略非数字参数
        }
    }
    System.out.println("数字之和：" + sum);
}</code>

Run the program:

<code>java MyProgram 10 20 30 40</code>

Output:

<code>数字之和：100</code>

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