import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
 
public class ReadLastLine{
 
 public static void main(String[] args) throws Exception {
 
  FileInputStream in = new FileInputStream("file.txt");
  BufferedReader br = new BufferedReader(new InputStreamReader(in));
 
  String strLine = null, tmp;
 
  while ((tmp = br.readLine()) != null)
  {
     strLine = tmp;
  }
 
  String lastLine = strLine;
 
  System.out.println(lastLine);
 
  in.close();
 }
}

RandomAccessFile rfile = new RandomAccessFile(file,"r"); 
      
rfile.seek(file.length()); 
Third One -
FileInputStream fis=new FileInputStream("D:\\ test\\sample.txt");
                  
String fileContent = new Scanner(fis).useDelimiter("\\Z").next()