Ahat is command line argument and when do we need that?

Question

command line argument

Answer 1

A command line arguement just means that you're taking input from the command line (command prompt) rather than a GUI or from your own code. It's achieved with a scanner that asks for in.nextInt() or any other variable type.

Answer 2

Command line argument is an argument that is sent via the command line.

Ex.
class CommandLineArgument{
public static void main(String [] args){
System.out.println(args[0]);
}
}

(After)
>javac CommandLineArgument.java
(in the command line you write:)
>java CommandLineArgument Something

Output:
Something

(The text you write after)
>java CommandLineArgument <here>

(is put into args[0].)

You can take as many args[] you like. The array will adjust/grow.

Answer 3

now I am clear with your answer but is it necessary to create a scanner i think in many case we use in.nextInt() but that is for giving the code from keyboard if not please raise my doubt

Answer 4

You do not need to create a Scanner-object to use the args[]-array.