Why is String arg[] used in main method of java?

Question

In the main method of java programme​ we write

public static void main(String arg[])

why is the String arg[] used?

Answer 1

Java program can be run by using cmd, this is where the String[] args come into play.

http://stackoverflow.com/questions/890966/what-is-string-args-parameter-in-main-method-javaIn 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]);
}
}
}

Answer 2

But we are not passing anything in the main method so why we use this parameter.

Answer 3

This was in the Bible.