import java.io.*; 
import java.util.*;
class TokenizerExample3 
{
   public static String a[];
   public static int i=0;
 
   public static int binarySearch(String[] a2, String searchItem) 
   {
	int first=0;
	int last = array.length - 1;
	int middle;
 
	boolean found = false;
 
	//Loop until found or end of list.
	while(first <= last &&!found) 
	{
	  middle = (first + last) /2;
	  if(array[middle]==(searchItem)) found = true;
 
          else 
	  { 
	     if(array[middle]==(searchItem))
	     last = middle -1;
	     else first = middle + 1;
           }
	 }// end while
 
	    if(found) return middle;
	    else return(-1);
	}//end binary search
 
	 /* Main method */
    public static void main(String[] args) throws IOException 
    {
	FileReader file = new FileReader("C:\\test.txt");
	BufferedReader fileInput = new BufferedReader(file);
	long numLines = 0;
 
	String line;
	do 
	{
	   line = fileInput.readLine();
	   if (line != null)
	{
        a[i] = line;
	numLines++;				
	}
	i++;
	}
		while (line != null);
		String searchItem = "hello"; 
                  //hello is at the 4th entry in the file
		binarySearch(a, searchItem);
}//end main	
}end class

//8 characters plus 1 line-terminated character (\r, \n)
int lineSizeInBytes = 9; 
//line in the file you want starting from 0
int line = 5; 
RandomAccessFile raf = new RandomAccessFile("myFile.dat","r");
raf.skipBytes(line*lineSizeInBytes);
String hash = raf.readLine();