My question is where exactly and hoow to use decimal format to have numbers prin

Question

My question is where exactly and hoow to use decimal format to have numbers printed in ##.## format only?
Thanks!! HERE IS THE CLASS

mport java.text.DecimalFormat;
import java.util.Scanner;
public class PenguinShavedIce {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
      
  
      
       Scanner scan = new Scanner(System.in);
      
       System.out.println("Enter the name of the shop");
          String Name = scan.nextLine();
          System.out.print("Enter   zip code: ");
          String Location = scan.nextLine();
          IceStand iceStand = new IceStand(Name, Location);
          System.out.println();
          int small = 0;
          while(small != -1)
           {
            System.out.print("Enter number of small (-1 to stop).....");
            small = scan.nextInt();
            System.out.print("Enter number of medium......");
            int medium = scan.nextInt();
            System.out.print("Enter number of large......");
            int large = scan.nextInt();
          
            DecimalFormat fmt = new DecimalFormat("##.##");
          
            System.out.println(iceStand.ToString());
            System.out.println("             ////////~~~\\\\\\\\");
            Snowball smallSnowball = new Snowball();
            Snowball mediumSnowball = new Snowball();
            Snowball largeSnowball = new Snowball();
            double smallTotal = smallSnowball.calculatePrice("Small",small);
            double mediumTotal = mediumSnowball.calculatePrice("Medium", medium);
            double largeTotal = largeSnowball.calculatePrice("Large",large);
            System.out.println(smallSnowball.ToString());
            System.out.println(mediumSnowball.ToString());
            System.out.println(largeSnowball.ToString());
          
            double subTotal = (smallTotal+ mediumTotal+ largeTotal);
            System.out.println("");
            System.out.println("Subtotal "+ "$"+fmt.format(subTotal));
            double TAX =Snowball.calculateTAX(subTotal);
            System.out.println("Tax(6%) " +" $"+Snowball.calculateTAX( subTotal));
            System.out.println("Total bill " + "$"+(subTotal+TAX));
           }
          }
       }

Explanation / Answer

/*
* A DecimalFormat class is usually used while displaying results of a calculations
* A double (or float) returns 10places after decimal point, but we are only interested in 2-3 places
* Hence we need to user DecimalFormat class for rounding and displaying only the required number of digits
* Its constructor DecimalFormat fmt = new DecimalFormat("#.00");
* means print all the numbers before decimal and only two digits after decimal
*
* //example
       double value = 4535.246456;
       System.out.println("Original double value is: "+value);
       DecimalFormat fmt = new DecimalFormat("#.00");
       System.out.println("double after format: "+fmt.format(value));
*/
import java.text.DecimalFormat;
import java.util.Scanner;

public class PenguinShavedIce {
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);

       System.out.println("Enter the name of the shop");
       String Name = scan.nextLine();
       System.out.print("Enter zip code: ");
       String Location = scan.nextLine();
       IceStand iceStand = new IceStand(Name, Location);
       System.out.println();
       int small = 0;
       while (small != -1) {
           System.out.print("Enter number of small (-1 to stop).....");
           small = scan.nextInt();
           System.out.print("Enter number of medium......");
           int medium = scan.nextInt();
           System.out.print("Enter number of large......");
           int large = scan.nextInt();

           DecimalFormat fmt = new DecimalFormat("#.00");

           System.out.println(iceStand.ToString());
           System.out.println(" ////////~~~\\\\\\\\");
           Snowball smallSnowball = new Snowball();
           Snowball mediumSnowball = new Snowball();
           Snowball largeSnowball = new Snowball();
           double smallTotal = smallSnowball.calculatePrice("Small", small);
           double mediumTotal = mediumSnowball.calculatePrice("Medium", medium);
           double largeTotal = largeSnowball.calculatePrice("Large", large);
           System.out.println(smallSnowball.ToString());
           System.out.println(mediumSnowball.ToString());
           System.out.println(largeSnowball.ToString());

           double subTotal = (smallTotal + mediumTotal + largeTotal);
           System.out.println("");
           // here
           System.out.println("Subtotal " + "$" + fmt.format(subTotal));
           double TAX = Snowball.calculateTAX(subTotal);
           // here
           System.out.println("Tax(6%) " + " $" + Snowball.calculateTAX(subTotal));
           // and here
           System.out.println("Total bill " + "$" + (subTotal + TAX));
       }
      
      
   }
}

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