Java Programming

I just realized that I need to add a main class in my work, but I don't know what to put inside it.


Here's my code for one of my classes

import java.util.Scanner;

public class rectangle
{
    public static void main(String[] args)
    {
        int width;                  
        int height;                 
        int count = 1;

        Scanner scan = new Scanner (System.in);
        
        System.out.println("Please enter the width of the rectangle: ");
        width = scan.nextInt();

        System.out.println("Please enter the height of the rectangle: ");
        height = scan.nextInt();

        while (count <= width)
        {
            if(width < 1 || width > 30)
            {
                throw new IllegalArgumentException("The numbers must be  in range");              
            }
            
            if(height < 1 || height > 30)
            {
                throw new IllegalArgumentException("The numbers must be in range");
            }
            
            for (int star = 1; star <= height; star++)
            {
                System.out.print("*");
            }
            
            System.out.println();
            count++;

        }
    }
}

Now I don't know what to add to make this work from the main method.