While Loop Problem(s)

[Andrew Garczynski]

Hi, can some please point out the error im having with this code?

import javax.swing.*; 
public class WhileLoop{ 
  public static void main(String args[]) 
  { 

    double answer, money; 
    String temp = JOptionPane.showInputDialog("Please enter the conversion rate: "); 
    money = Double.parseDouble(temp); 

    while(answer !=(0)) 
    { 
      answer=Double.parseDouble(JOptionPane.showInputDialog("Please enter a sum in £. When" + 
      " 0 is entered, the program will terminate ")); 
      JOptionPane.showMessageDialog(null, "The conversion total is: " + 
      String.format("Rate: %.2d \nAmount £: %2d \nEuros €: %.2d") 
      + money, answer, money*answer); 
    } 

  } 
} 

These are the errors i'm getting:
I:\2nd Year\OOP 2\WhileLoop.java:15: cannot find symbol
symbol : variable string
location: class WhileLoop
string.Format("Rate: %.2d \nAmount £: %2d \nEuros €: %.2d")
^
I:\2nd Year\OOP 2\WhileLoop.java:14: cannot find symbol
symbol : method showMessageDialog(<nulltype>,java.lang.String,double,double)
location: class javax.swing.JOptionPane
JOptionPane.showMessageDialog(null, "The conversion total is: " +
^

[Jelle Klap]

Those compiler warnings seem out of sync with the code you posted.

[Wendy Gibbons]

i would expect the variables to go inside the string format method, just checked and yep, on the inside as a variable length argument list.

[Campbell Ritchie]

Having the variables added to String.format(...) with + operators should’t be a compiler error. The additional ) is, however. You can suffer an Exception when the % tags don’t match their arguments, but that is a problem for later on.

[Wendy Gibbons]

Campbell Ritchie wrote:Having the variables added to String.format(...) with + operators should’t be a compiler error. The additional ) is, however. You can suffer an Exception when the % tags don’t match their arguments, but that is a problem for later on.

see you learn something every day.

[Jeff Verdegan]

Andrew Garczynski wrote:
I:\2nd Year\OOP 2\WhileLoop.java:15: cannot find symbol
symbol : variable string
location: class WhileLoop
string.Format("Rate: %.2d \nAmount £: %2d \nEuros €: %.2d")
^

Read the message very closely. Remember, Java is case-sensitive.

I:\2nd Year\OOP 2\WhileLoop.java:14: cannot find symbol
symbol : method showMessageDialog(<nulltype>,java.lang.String,double,double)
location: class javax.swing.JOptionPane
JOptionPane.showMessageDialog(null, "The conversion total is: " +
^

The error message is telling you exactly what's wrong. (They usually do.) You're calling JOptionPane.showMessageDialog(null, String, double, double), but if you look at the docs for JOptionPane, you'll see there is no such method.

[Andrew Garczynski]

Got it to work, thanks guys
Andrew