Using arguments to run an application

Question

Hellow bodies, Im just a few weeks old in Java, could anyone please help with the following...
public class SquareTool {
public SquareTool(String input) {
try {
float in = Float.parseFloat(input);
Square sq = new Square(in);
float result = sq.value;
System.out.println("The square of " + input + " is " + result);
} catch (NumberFormatException nfe) {
System.out.println(input + " is not a valid number.");
class Square {
float value;
Square(float x) {
value = x * x;
public static void main(String[] arguments) {
if (arguments.length < 1) {
System.out.println("Usage: java SquareTool number");
} else {
SquareTool dr = new SquareTool(arguments[0]);
/* I dont know how to use this argument (java SquareTool 13) in a command line to run the above program to get the
* following result (The square of 13 is 169.0).
* If the program is run without arguments it will give the following result: Usage: java SquareTool number
* My question is where do I introduce the arguments??
*/

Answer 1

java SquareTool 13