Need Help Please

Hi, I'm new with Java, and I need help with a program that I wrote.
It needs to prompt the user for the x value, the y value, and the radius value, and then display the info in a JTextArea. Is giving me the following error:

I don't know what I'm doing wrong. I would really appreciate your help with this. This is the code i have:

import javax.swing.*;
public class CircleTest {
// strings entered by user   
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),        
       yinput = JOptionPane.showInputDialog( "Enter value of y:" ),       
       radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" ),
       result;
int x, // x-coordinate of Circle's center        
    y; // y-coordinate of Circle's center   
double radius; // Circle's radius
   // convert numbers from type String to type int
      x = Integer.parseInt( xinput );
      y = Integer.parseInt( yinput );
 // convert number from type String to type Double
      radius = Double.parseDouble( radiusinput );
      //create JTextArea to display output
       JTextArea  display = new JTextArea( );
   //  Circle's initial x-y coordinates and radius
      result = "X coordinate is " + x + 
         "\nY coordinate is " + y + 
         "\nRadius is " + radius;
      // String representation of new circle value
      result += "\n\nThe new location and radius of circle are\n" +
                  "Center = [" + x + ", " + y + "]; Radius = " + radius;
      // Circle's diameter
   result += "\nDiameter is " + 
         ( 2 * radius )"; Radius = " + radius;
      // Circle's circumference
      result += "\nCircumference is " +
        (2 * Math.PI * radius);
      // Circle's area
      result += "\nArea is " + ( Math.PI * radius * radius );
     
     // display results
      JOptionPane.showMessageDialog( null, display, JOptionPane.INFORMATION_MESSAGE );
      System.exit( 0 );
   } // end main
} // end class CircleTest

Thank you so much.

Hi,
First of all, there is no main() method signature in your code.
once you define the main() method, pay attention to the string literal ""
they should appear in pair. <- compiler will tell you about this.
also, pay attention to the parameter pass to JOptionPane.showMessageDialog();
[ November 15, 2003: Message edited by: chi Lin ]

Thanks a lot. Now is giving me these three errors:

This is how I changed the code:
import javax.swing.*;
public class CircleTest {
    public static void main( String args[] )
    {
// strings entered by user   
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),        
       yinput = JOptionPane.showInputDialog( "Enter value of y:" ),       
       radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" );
int x, // x-coordinate of Circle's center        
    y; // y-coordinate of Circle's center   
double radius; // Circle's radius
   // convert numbers from type String to type int
      x = Integer.parseInt( xinput );
      y = Integer.parseInt( yinput );
 // convert number from type String to type Double
      radius = Double.parseDouble( radiusinput );
      //create JTextArea to display output
       JTextArea  output = new JTextArea( );
   //  Circle's initial x-y coordinates and radius
       String result = "X coordinate is " + x +
       "\nY coordinate is " + y +
       "\nRadius is " + radius;
       
   //  Circle's values 
       result += "\n\nThe new location and radius of circle are\n";
       "Center = [" + x + ", " + y + "]; Radius = " + radius;
  
   //  Circle's diameter   
       result += "\nDiameter is " + 2 * radius; "Radius = " + radius;
   
   //  Circle's circunference    
       result +=  "\nCircumference is " + (2 * Math.PI * radius);
      // Circle's area
       result += "\nArea is " + ( Math.PI * radius * radius );
     // display results
      JOptionPane.showMessageDialog( null, output, JOptionPane.INFORMATION_MESSAGE );
      System.exit( 0 );
   } // end main
} // end class CircleTest

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