Fahrenheit 9/11

How can I get this program to exit without touching the do loop, please help I tryed for hours and could not understand.

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

public class (Celcius2Farenheit
static String x2 = "exit";

static Scanner = new Scanner (System.in);


/ **
* @ Param args
* @ Return
*
public static void main (String [] args) (
/ / TODO Auto-portal method generated

null JOptionPane.showMessageDialog ("Running Start ..."," Celsius Fahrenheit by Neil D'Souza, JOptionPane.INFORMATION_MESSAGE);
null JOptionPane.showMessageDialog ("Conversion Celsius to Fahrenheit);


C (

System.out.println ("Please enter a temperature to convert");
String userinput = scanner.nextLine ();
if (userInput.equals (x2));



try (

CEL = double Double.parseDouble (userinput);
celToF (CEL);


) Catch (NumberFormatException ex) (
System.err.println ("Invalid characters);





)


) While (true);


)








Public static void Exit () (
if (scanner.nextLine (). equals (x2));
null JOptionPane.showMessageDialog ("Withdrawal Conversion Celsius to Fahrenheit", "Exit", JOptionPane.INFORMATION_MESSAG ...
System.exit (-1);

)

public static double celToF (CEL double) (
double farenheit = cel * 9 / 5.0 + 32.0;
null JOptionPane.showMessageDialog ("temperature" + "" + CEL + "" + "C" + "" + "is" + "Fahrenheit + +" "+" Fahrenheit);

Fahrenheit return;


)
)

your last line before the entrance)
System.exit. (0);

my schedule was like that;


javax.swing.JOptionPane import;

public class convertfahrenheittocelsius
(
public static void main (String [] args)
(

/ / Declare variables
Double fahrenheit;

/ / Declare input string
degreesfahrenheitstr String;

/ / Declare output channel
C string;

/ / Get feedback
degreesfahrenheitstr =
JOptionPane.showInputDialog
("Enter degrees Fahrenheit:");

/ / Analysis of a double
Fahrenheit = Double.parseDouble (degreesfahrenheitstr) ...

/ / Output Format String Fahrenheit Format
Celsius = String.Format
("Your temperature is% .2 f degrees Celsius" (Fahrenheit - 32) * (5,0 / 9,0));

/ / Output of message box
JOptionPane.showMessageDialog (null, C,
"Your temp in degrees Celsius," JOptionPane.INFORMATION_MESSAGE);
/ Program / Output
System.exit (0);

)
)



Hope this helps:)