What is "String args[]"? parameter in main method Java

In Java args contains the supplied command-line arguments as an array of String objects.

In other words, if you run your program as java MyProgram one two then args will contain ["one", "two"].

If you wanted to output the contents of args, you can just loop through them like this...

public class ArgumentExample {    public static void main(String[] args) {        for(int i = 0; i < args.length; i++) {            System.out.println(args[i]);        }    }}

Those are for command-line arguments in Java.

In other words, if you run

java MyProgram one two

Then args contains:

[ "one", "two" ]

public static void main(String [] args) {    String one = args[0]; //=="one"    String two = args[1]; //=="two"}

The reason for this is to configure your application to run a particular way or provide it with some piece of information it needs.

If you are new to Java, I highly recommend reading through the official Oracle's Java™ Tutorials.

args contains the command-line arguments passed to the Java program upon invocation. For example, if I invoke the program like so:

$ java MyProg -f file.txt

Then args will be an array containing the strings "-f" and "file.txt".