JOption problems

I had to convert a code to JOption and can't get it to compile

import java.util.Scanner;
   import java.text.DecimalFormat;
   import javax.swing.JOptionPane;
   public class WindowsDemo
   {
      public static void main(String [] args)
      {
      //local variables
         double weight;
         int miles;
      
      //Create a Scanner object
         Scanner keyboard = new Scanner(System.in);
      
      //Create a DecimalFormat object
         DecimalFormat money = new DecimalFormat("0.00");
      
      //Get the package weight and miles shipped
         weight = 
            JOptionPane.showInputDialog("Enter the package weight: ");
         miles =
            JOptionPane.showInputDialog("Enter the miles shipped: ");
      
      //Create a ShippingCharges object
         ShippingCharges myPackage = new ShippingCharges (weight, miles);
      
      //Display the total charges
         JOptionPane.showMessageDialog
            (null, "Total Charges will be $" 
            +  money.format(myPackage.getShippingCharges()));
      	
      }
   }

the error code reads

What is the returned type of the method you are calling here ? Did you check the API ?

so now I am getting a new error

import java.text.DecimalFormat;
   import javax.swing.JOptionPane;
   public class WindowsDemo
   {
      public static void main(String [] args)
      {
      //local variables
         double weight;
         int miles;
			String milesString;
			String weightString;
      
      //Create a DecimalFormat object
         DecimalFormat money = new DecimalFormat("0.00");
      
      //Get the package weight and miles shipped
         weightString = 
            JOptionPane.showInputDialog("Enter the package weight: ");
         milesString =
            JOptionPane.showInputDialog("Enter the miles shipped: ");
      
		//Convert 
			weight = Integer.parseInt(weightString);
			miles = Double.parseDouble(milesString);
			
      //Create a ShippingCharges object
         ShippingCharges myPackage = new ShippingCharges (weight, miles);
      
      //Display the total charges
         JOptionPane.showMessageDialog
            (null, "Total Charges will be $" 
            +  money.format(myPackage.getShippingCharges()));
      	
      }
   }

now it is saying loss of precision on miles parsedouble

Look at how you define your variables:

And look at how you try to parse them:

Does the parse method match the variable type?

You declared miles to be an int and weight to be a double. It looks like you're not calling parseInt/parseDouble for the right variables.

(ps: avoid calling your variables like xxxString. It's useless to put their type in their name)