how to readf rom file in java code example

Example: java read text file

// java read text file with scanner
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class JavaReadTextFileScanner
{
   public static void main(String[] args) throws FileNotFoundException
   {
      File fl = new File("B:\demo.txt");
      Scanner sc = new Scanner(fl);
      while(sc.hasNextLine())
      {
         System.out.println(sc.nextLine());
      }
      sc.close();
   }
}