Delimiters Uses:

The Scanner class basically parses input from the source into tokens by using delimiters to identify the token boundaries. The default delimiter is whitespace:[ \t\n\x0B\f\r] 
package com.java;
import java.util.Scanner;
public class Delimeter 
{
	public static void main(String args[])
	{
	    String input = "1 Hi 2 Hi Danish Hi Gahlout Hi";
	    Scanner s = new Scanner(input).useDelimiter("\\s*Hi\\s*");
	    System.out.println(s.nextInt());
	    System.out.println(s.nextInt());
	    System.out.println(s.next());
	    System.out.println(s.next());
	    s.close();
	}
}
Output:
1
2
Danish
Gahlout

Command Line Arguments

Java application can accept any number of arguments directly from the command line. The user can enter command-line arguments when invoking the application. When running the java program from java command, the arguments are provided after the name of the class separated by space.

public class RectangleUser
{
	public static void main(String args[])
	{
		int width;
		int height;
		int area;
		int perimeter;
		width=Integer.parseInt(args[0]);
		height=Integer.parseInt(args[1]);
		area=width*height;
			perimeter=2*(width+height);
		System.out.println("Area of Rectangle: "+area);
		System.out.println("Perimeter of Rectangle: "+perimeter);
	}
}