class or interface expected?

[Brandi Love]

I keep getting these errors for a program I wrote, not sure how to fix them. I've looked over the program numerous times and it looks okay to me. Anyone have any idea how I can fix them so I can compile? I included the program and the error messages below.
(if ya want to know what the program is supposed to do, the problem is included in the program.)

/*
If P is the population on the first day of the year, B is the birth rate, and D is
the death rate, the estimated population at the end of the year is given by the
formula:
Pend=(1+(B-D)/100)*Pstart
And the population growth rate is given by the formula: B-D
Write a program that prompts the user to enter the starting population, birth and
death rates, and n, the number of years. The program should then calculate and print
the estimated population after n years. Your program should have at least a growthRate
and an estimatedPopulation method. Be sure that you do data validation before doing
any computation.
*/
import java.io.*;
public class PopEstimate
{
        public static void main(String[] args)
        throws java.io.IOException
        {
                String s1, s2, s3, s4;
int population;
                double years, bRate, dRate;
                InputStreamReader isr = new InputStreamReaser(System.in);
                BufferedReader br = new BufferedReader(isr);
                System.out.println("Please enter the starting population:");
                s1 = br.readLine();
                population = Integer.parseInt(s1);
                System.out.println("Please enter the number of years you would like an estimate for:");
                s2 = br.readLine();
                years = Double.parseDouble(s2);
                System.out.println("Please enter the birth rate:");
                s3 = br.readLine();
                bRate = Double.parseDouble(s3);
                System.out.println("Please enter the death rate:");
                s4 = br.readLine();
                dRate = Double.parseDouble(s4);
                int gRate = growthRate(bRate, dRate);
                double PopEst, PopEstRounded = estimatedPopulation(gRate, population, years);
System.out.println("Estimated population in " + years + " years: " + PopEstRounded);
        }
        public static double growthRate(double bRate, double dRate)
        {
                double gRate;
                grate = bRate - dRate;
                return gRate;
        }
        public static double estimatedPopulation(double gRate, int population, double years)
        {
                double PopEst, PopEstRounded;
                PopEst = (1+ gRate * years) * population;
                PopEstRounded = Math.ceil(PopEst);
                return PopEstRounded;
        }
}
}
  

errors: C:\My Documents\PopEstimate.java:71: 'class' or 'interface' expected
}
^
C:\My Documents\PopEstimate.java:73: 'class' or 'interface' expected
^
2 errors

[Ernest Friedman-Hill]

Did you look at around line 71? Looks to me like you've got an extra closing brace at the end of the file. The error message means that whereas the only legal code at that point would be "class" or "interface", the compiler saw "}".
A real programmer's editor would have told you about this right away -- are you just editing code in Notepad or something? Using better tools can make you life easier!