Roman Numeral converter

Question

Hey, I've received an error message in my roman numeral program and am not what I'm doing wrong.
Here's the error:
C:\Documents and Settings\Mitch Thul\Desktop\Java2\lab5\Roman2.java:22: cannot find symbol
symbol : variable length
location: class java.lang.String
               for(int i = 0; i <= roman.length - 2; i++)
^
C:\Documents and Settings\Mitch Thul\Desktop\Java2\lab5\Roman2.java:25: cannot find symbol
symbol : method charAt(int)
location: class Roman2
                    if((charAt(i)) >= (charAt(i+1)))
^
C:\Documents and Settings\Mitch Thul\Desktop\Java2\lab5\Roman2.java:25: cannot find symbol
symbol : method charAt(int)
location: class Roman2
                    if((charAt(i)) >= (charAt(i+1)))
^
3 errors
Tool completed with exit code 1
And here's my code:
//Mitch Thul 3059899
import java.util.Scanner;
import java.lang.String;
public class Roman2
     public static void main(String[] arg)
          Scanner keyboard = new Scanner(System.in);
          String date;
          System.out.println("Please enter a roman numeral date:");
          date = keyboard.next();
          System.out.println("Roman numeral = " + date);
          public static int romanToInt(String roman)
               //takes a string of roman numerals (date) and produces corresponding int
               int n; //value of next numeral
               roman = roman + "0"; //adds 0 to the end of the numeral string (for simplification)
               int total = 0; //start at position 0
               for(int i = 0; i <= roman.length - 2; i++)
                    n = numeralToInt(roman.charAt(i));
                    if((charAt(i)) >= (charAt(i+1)))
                         total += n; // add n to the total
                    else
                         total -= n; //subtract n from the total
                    return total;
          private static int numeralToInt(char ch)
               switch(ch)
                    case 'M': return 1000;
                    case 'D': return 500;
                    case 'C': return 100;
                    case 'L': return 50;
                    case 'X': return 10;
                    case 'V': return 5;
                    case 'I': return 1;
                    case '0': return 0;
               return 0;
}Thanks in advance for any help.

Answer 1

Not sure how to finalize the output into looking like this:
Roman numeral date + " is the year " + Integer date
Here's the error message I receive:
C:\Documents and Settings\Mitch Thul\Desktop\Java2\lab5\Roman2.java:14: cannot find symbol
symbol : variable n
location: class Roman2
          System.out.println(date + " is the year " + n);
^
1 error
Tool completed with exit code 1
And here's my code again:
//Mitch Thul 3059899
import java.util.Scanner;
import java.lang.String;
public class Roman2
     public static void main(String[] arg)
          Scanner keyboard = new Scanner(System.in);
          String date;
          System.out.println("Please enter a roman numeral date:");
          date = keyboard.next();
          System.out.println(date + " is the year " + n);
     public static int romanToInt(String roman)
          //takes a string of roman numerals (date) and produces corresponding int
          int n; //value of next numeral
          roman = roman + "0"; //adds 0 to the end of the numeral string (for simplification)
          int total = 0; //start at position 0
          for(int i = 0; i <= roman.length() - 2; i++)
               n = numeralToInt(roman.charAt(i));
               if((roman.charAt(i)) >= (roman.charAt(i+1)))
                    total += n; // add n to the total
               else
                    total -= n; //subtract n from the total
               return n;
     private static int numeralToInt(char ch)
          switch(ch)
               case 'M': return 1000;
               case 'D': return 500;
               case 'C': return 100;
               case 'L': return 50;
               case 'X': return 10;
               case 'V': return 5;
               case 'I': return 1;
               case '0': return 0;
          return 0;
}Can't figure out how to finish things up.