Problem with Loop

I am new to java and in this assignment I need to make a spot to enter the customer's name and amount of kilowatt usage. I need to do this for three people, the first time through it works fine but after that there is no place to put the customer's name during the process. In our class we write it up in notebook and run from the command prompt. The input only appears in command prompt while output shows in the joption pane.

Code java:

---

//
 import javax.swing.JOptionPane;
import java.util.Scanner;
 
public class Electric1//Exercise 1 not complete
{
	public static void main(String args[])
	{
		Scanner input = new Scanner(System.in);
 
		String name;
		int kilowatts;
		String message = "";
		double pay;
 
 
		System.out.print("What is your name?");
		name =  input.nextLine();
 
		kilowatts = System.out.print("How many kilowatts did you use?");
 
 
		pay = kilowatts * .056;
 
		message = String.format("%s, you owe $%.2f", name, pay);
 
		JOptionPane.showMessageDialog(null, message);
	}
}

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kilowatts = System.out.print("How many kilowatts did you use?");

That doesn't make any sense.

The method println() is void...which means it doesn't return anything.

However...this would work...but that's not what you're doing so don't use it....

Code java:

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kilowats = Integer.parseInt(JOptionPane.showMessageDialog(null, "How many kilowatts did you use?" , "Enter Kilowatt usage", JOptionPane.QUESTION_MESSAGE));

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Your code...using command line...should be:

Code java:

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System.out.println("How many kilowatts do you use?");
kilowats = input.nextInt();

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To get output for three people...put your code in the for loop.

Make sure to initialize all variables before starting the for loop.

Code java:

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for (int i =0; i < 3; i++)
{
 
// put the code you have here and it will go through 3 times.
 
}

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Thank you for pointing out about kilowatt, you were right on that point but it still doesn't fix my problem. here is the new code, hopefully you can figure out where I am going wrong.

Code Java:

---

//import javax.swing.JOptionPane;
import java.util.Scanner;
 
public class Electric1
{
	public static void main(String args[])
	{
		Scanner input = new Scanner(System.in);
 
		String name;
		int kilowatts;
		String message = "";
		double pay;
		int counter = 1;
 
		while(counter < 4)
		{		
 
			System.out.print("What is your name?");
			name =  input.nextLine();
 
			System.out.print("How many kilowatts did you use?");
			kilowatts = input.nextInt();
 
			pay = kilowatts * .056;
 
			message = String.format("%s, you owe $%.2f", name, pay);
 
			JOptionPane.showMessageDialog(null, message);
 
			counter++;
		}
	}
}

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I know I am doing something wrong but I can not see it. To me this looks right but like I said I am new to java.

What is your problem?

What output are you getting?

What output are you expecting?

If you remove "JOptionPane.showMessageDialog(null, message);" from your code, it will work fine, but I can't figure out why :P.
Might be down to not specifying a parent, and its therefore not appearing in the foreground?
With that in mind, It is late and you should take my guess with a very small pinch of salt ^^.

I also have this same exact problem for class. I used the information below and when i go to compile it ask the name and the watts for the first person just fine and then it will ask the name and watts for the second person all at one time. is there any advice that can help me with this?

Here is my code

Code Java:

---

import java.util.Scanner;
 
public class Electric1
{
    public static void main(String args[])
    {
        Scanner input = new Scanner(System.in);
 
        String name;
        int kilowatts;
        String message = "";
        double pay;
        int counter = 1;
 
        while(counter < 4)
        {       
	    //Ask name
            System.out.print("What is your name?");
            name =  input.nextLine();
 
            System.out.print("How many kilowatts did you use?");
            kilowatts = input.nextInt();
 
            pay = kilowatts * .056;
 
            message = String.format("%s, you owe $%.2f", name, pay);
 
	    JOptionPane.showMessageDialog(null, message);
 
            counter ++;
        }
    }
}

---

Output expected is that in command prompt it will ask for the name and how kilowatts. It will then give the answer in the joptionpane. The first customer works fine but when the second time comes up it pushes pass the name and automatically goes to the kilowatt question.

There has to be a joptionpane because that is the way the teacher wants it. Actually she said this will be how all our programs have to run.

I have a capture of the command prompt.

Quote:

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Originally Posted by Dragonkndr712

Output expected is that in command prompt it will ask for the name and how kilowatts. It will then give the answer in the joptionpane. The first customer works fine but when the second time comes up it pushes pass the name and automatically goes to the kilowatt question.

There has to be a joptionpane because that is the way the teacher wants it. Actually she said this will be how all our programs have to run.

I have a capture of the command prompt.

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I have the exact same homework. Not sure about your problem but i think its where your "name = input.nextLine(); remove Line and make it "name = input.next();" without quotations. Hopefully that works.

Quote:

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Originally Posted by anthony23415

I have the exact same homework. Not sure about your problem but i think its where your "name = input.nextLine(); remove Line and make it "name = input.next();" without quotations. Hopefully that works.

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Tried to do that with no luck..

Quote:

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Originally Posted by Chappell817

Tried to do that with no luck..

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This is what I did.

Code Java:

---

 
import java.util.Scanner;
import javax.swing.JOptionPane;
 
public class Electric1
{
    public static void main(String args[])
    {
        Scanner input = new Scanner(System.in);
 
        String name;
        int kilowatts;
        double total;
        int counter = 1;
 
        while(counter < 4)
        {       
        //Ask name
            System.out.println("What is your name?");
            name =  input.next();
            System.out.println("How many kilowatts did you use?");
            kilowatts = input.nextInt();
 
            total = kilowatts * .056;
 
            String message = String.format("%s $%.02f", name, total);
 
            JOptionPane.showMessageDialog(null, message);
 
            counter = counter + 1;
        }
    }
}

---

Quote:

---

Originally Posted by anthony23415

This is what I did.

Code Java:

---

 
import java.util.Scanner;
import javax.swing.JOptionPane;
 
public class Electric1
{
    public static void main(String args[])
    {
        Scanner input = new Scanner(System.in);
 
        String name;
        int kilowatts;
        double total;
        int counter = 1;
 
        while(counter < 4)
        {       
        //Ask name
            System.out.println("What is your name?");
            name =  input.next();
            System.out.println("How many kilowatts did you use?");
            kilowatts = input.nextInt();
 
            total = kilowatts * .056;
 
            String message = String.format("%s $%.02f", name, total);
 
            JOptionPane.showMessageDialog(null, message);
 
            counter = counter + 1;
        }
    }
}

---

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Thanks i think you help me figure out what i was doing wrong..but not 100% sure..

That worked not sure why but my program works now. Thank you.

got that actually in class now trying to work on the second problem

Quote:

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Originally Posted by Chappell817

got that actually in class now trying to work on the second problem

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If you dont mind asking? You go to UTA? and have class at 9:30 am in room 255 for that java class?