error at readLine

[agnivohneb]

I have been taking some classes for java and I have a problem that i cant seem to solve

the error is
The method "java.lang.String readLine() throws java.io.IOException;" can throw the checked exception "java.io.IOException", so its invocation must be enclosed in a try statement that catches the exception, or else this method must be declared to throw the exception.

i get this error at every instance of in.readLine()

here is the code

Java:

import java.util.*; import java.io.*; public class CalcuGator {     public static void main (String[] args)     {         Calc newCalc = new Calc ();         BufferedReader in = new BufferedReader (new InputStreamReader (System.in));         boolean exit = false;         String exitString = "";         while (!exit)         {             System.out.print ("Please enter your first number: ");             newCalc.num1 = Double.valueOf (in.readLine ()).doubleValue ();             System.out.print ("Please enter your second number: ");             newCalc.num2 = Double.valueOf (in.readLine ()).doubleValue ();             System.out.println (newCalc.divide ());             System.out.println (newCalc.multiply ());             System.out.println (newCalc.add ());             System.out.println (newCalc.subtract ());             while (exitString == "")             {                 System.out.print ("Would you like to exit? (y or n): ");                 exitString = in.readLine ();                 if (exitString == "y")                 {                     exit = true;                 }                 else if (exitString == "n")                 {                     exit = false;                 }                 else                 {                     System.out.println ("Invalid Input!");                     exitString = "";                 }             }         }     } }

Java:

public class Calc {     public static double num1;     public static double num2;     public static String divide ()     {         if (num2 == 0)         {             return "Cannot divide by 0";         }         else         {             return Double.toString(divideNoErr ());         }     }     public static double divideNoErr ()     {         return num1 / num2;     }     public static double multiply ()     {         return num1 * num2;     }     public static double add ()     {         return num1 + num2;     }     public static double subtract ()     {         return num1 - num2;     } }

Could anyone tell me what that error means and how i can solve this problem? thanks

[agnivohneb]

never mind i figured it out... i forgot to add throws IOException to main