import java.io.*;
import java.util.Scanner;

/** Reading with a Scanner 

    @author P. Conrad (adapted it for CS56 and added comments)
    @see also <a href="http://www.javapractices.com/topic/TopicAction.do?Id=42">http://www.javapractices.com/topic/TopicAction.do?Id=42</a>
    

 */

public class ReadFromFile2 {
    
    public static void main(String [] args) {
        
        if (args.length != 1) {
            System.err.println("Usage: java ReadFromFile2 filename");
            System.exit(1);
        }
        
        int lineNumber = 0;
        
        Scanner scanner = null;

	/* try { */

	// The next line is typical of stuff you'll see in Java.
	// Each nested constructor adds some "layer"---and
	// each thing inside represents one of several "choices".
        
	scanner = new Scanner(new FileReader(new File(args[0])));
        
	// Use a Scanner to get each line
        
	while ( scanner.hasNextLine() ){
	    String thisLine = scanner.nextLine();
	    lineNumber ++;
	    System.out.printf("[%04d] %s\n",lineNumber,thisLine);
	}
        
	/*    } catch (Exception e) {
	      System.out.println("Ooops, an exception! " + e);
	      // e.printStackTrace();
	      }
	      finally {
	      scanner.close();
	      } // try/catch/finally */
        
    } // main
    
}