java - Unreachable code in eclipse

Question

What does the following mean?

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Unreachable Code    
at mycode.sample.main(sample.java:24) 

I'm hoping I can find the line where the error occurred. I thought "24" is the line, but I only have 23 lines of code in my project.

Here's the project code

package mycode;
import java.io.*;

public class sample {
  int first;
  int second;

  public sample (int fir,int sec)
  {
    fir = first;
    sec = second;
  }

  public void add()
  {
    System.out.println(first+second);       
  }

  public static void main(String[] args) throws IOException
  {
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    int f = Integer.parseInt(reader.readLine());
    // int s =  Integer.parseInt(reader.r   eadLine());
    sample sample2 = new sample(f,100);
    sample2.add();
  } 
}   

I would like to understand this error message. Thanks in advance.

Answer 1

Try changing your constructor, from:

public sample (int fir,int sec)
{
    fir = first;
    sec = second;
}

to:

public sample (int fir,int sec)
{
    first = fir;
    second = sec;
}