Programming Forums > Application Development > Java

kewlgeye · May 29th, 2008, 12:22 PM

can someone please tell me what is wrong with this code? I really am a novice after reading so much and watching tutorials, and I am still not getting the most basic things.

(Toggle Plain Text)

import java.util.*;
import javax.swing.*;
import javax.swing.JOptionPane;


public class Main {
String user = JOptionPane.showInputDialog("Please enter a number: ");
int userPar = Integer.parseInt(user);
int num = 25;
int result = userPar * num;
String user2 = JOptionPane.showMessageDialog(result);

    
    public static void main(String[] args) {
	new Main();
    }

}

andro · May 29th, 2008, 10:29 PM

(Toggle Plain Text)

String user2 = JOptionPane.showMessageDialog(result);

JOptionPane.showMessageDialog() returns void, not a String. What are you trying to do here?

kewlgeye · May 30th, 2008, 12:25 PM

Quote:

Originally Posted by andro

(Toggle Plain Text)

String user2 = JOptionPane.showMessageDialog(result);

JOptionPane.showMessageDialog() returns void, not a String. What are you trying to do here?

Thank you for replying.

what I am trying to do is to get the number that the user enters in the first joptionpane window and multiply it with the int variable that is equal to 25 and then display the result in another window. I thought that I was doing that. Is their another way?

andro · May 30th, 2008, 12:38 PM

Just do this:

(Toggle Plain Text)

JOptionPane.showMessageDialog(result);

Leave out the part where you assign it to the String user2.

andro · May 30th, 2008, 12:38 PM

Delete this.

kewlgeye · May 30th, 2008, 3:05 PM

Quote:

Originally Posted by andro

Delete this.

Here is the code that I have now, and I am still receiving the cannot find symbol error. ??

(Toggle Plain Text)

import java.util.*;
import javax.swing.*;
import javax.swing.JOptionPane;


public class dif {

	public dif()	{
	String user = JOptionPane.showInputDialog("Please enter a number: ");
	int userPar = Integer.parseInt(user);
	int num = 25;
	int rand = (int)(10.0 * Math.random()) + 1;
	int result = userPar * rand;
	
	JOptionPane.showMessageDialog(result);
	}
    public static void main(String[] args) {
	new dif();
    }

}

andro · May 30th, 2008, 4:03 PM

http://java.sun.com/j2se/1.5.0/docs/...a.lang.Object)

JOptionPane.showMessageDialog(null, result);

kewlgeye · Jun 2nd, 2008, 2:11 AM

Thank you, this worked. I just have to keep on practicing until it becomes second nature.

Thanks again.

May 29th, 2008, 12:22 PM	#1
kewlgeye Programmer Join Date: Jan 2008 Posts: 54 Rep Power: 1	Cannot Find Symbol can someone please tell me what is wrong with this code? I really am a novice after reading so much and watching tutorials, and I am still not getting the most basic things. (Toggle Plain Text) import java.util.; import javax.swing.; import javax.swing.JOptionPane; public class Main { String user = JOptionPane.showInputDialog("Please enter a number: "); int userPar = Integer.parseInt(user); int num = 25; int result = userPar * num; String user2 = JOptionPane.showMessageDialog(result); public static void main(String[] args) { new Main(); } } import java.util.; import javax.swing.; import javax.swing.JOptionPane; public class Main { String user = JOptionPane.showInputDialog("Please enter a number: "); int userPar = Integer.parseInt(user); int num = 25; int result = userPar * num; String user2 = JOptionPane.showMessageDialog(result); public static void main(String[] args) { new Main(); } }

May 29th, 2008, 10:29 PM	#2
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 319 Rep Power: 4	Re: Cannot Find Symbol (Toggle Plain Text) String user2 = JOptionPane.showMessageDialog(result); String user2 = JOptionPane.showMessageDialog(result); JOptionPane.showMessageDialog() returns void, not a String. What are you trying to do here? __________________ http://www.kevinherron.com/

May 30th, 2008, 12:38 PM	#4
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 319 Rep Power: 4	Re: Cannot Find Symbol Just do this: (Toggle Plain Text) JOptionPane.showMessageDialog(result); JOptionPane.showMessageDialog(result); Leave out the part where you assign it to the String user2. __________________ http://www.kevinherron.com/

May 30th, 2008, 12:38 PM	#5
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 319 Rep Power: 4	Re: Cannot Find Symbol Delete this. __________________ http://www.kevinherron.com/ Last edited by andro; May 30th, 2008 at 12:39 PM. Reason: Double post.

May 30th, 2008, 4:03 PM	#7
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 319 Rep Power: 4	Re: Cannot Find Symbol http://java.sun.com/j2se/1.5.0/docs/...a.lang.Object) JOptionPane.showMessageDialog(null, result); __________________ http://www.kevinherron.com/

Jun 2nd, 2008, 2:11 AM	#8
kewlgeye Programmer Join Date: Jan 2008 Posts: 54 Rep Power: 1	Re: Cannot Find Symbol Thank you, this worked. I just have to keep on practicing until it becomes second nature. Thanks again.

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Programming Forums > Application Development > Java

Cannot Find Symbol