import java.io$.*$;

import java.util.Scanner;

public class BillSummary

$\{$

static final String FILENAME $=$ "energy.txt$"$;

public static void main$($String$[]$ args$)$

$\{$

$//$ Start file processing

try

$\{$

String filename $=$ FILENAME;

File dataFileRef $=$ new File$($filename$)$;

$//$ Check for file existence. If not found, display error and crash

if $(!$dataFileRef.exists$())$

$\{$

System.out.println$("$File not found"$)$;

System.exit$(0)$;

$\}$

Scanner inputFile $=$ new Scanner$($dataFileRef$)$;

$//$ File processing loop.

$\}$

catch $($IOException e$)//$ If file error, display message and crash

$\{$

System.out.println$("$File error"$)$;

System.exit$(0)$;

$\}$

$\}$

$\}$