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


class UseScanner {

    // This method reads a text file and prints its contents to the screen
    // it illustrates using the scanner class. 
    // the name of the text file is taken from the input arguments
    // or input by the user. 
    public static void main(String[] args) throws FileNotFoundException {
      // Now get a filename to read unless it was given in a command line argument.
	Scanner in = new Scanner(System.in);
	System.out.println();
	String filename;
	if (args.length==0) {
	    System.out.println("Enter a filename to read:");
	    filename = in.nextLine();	  
	}
	else filename = args[0];
	
      // read from a file line by line, printing out to screen.
	System.out.println("Reading file " + filename + " and printing to screen.");
	Scanner filescan = new Scanner(new File(filename));
	while (filescan.hasNextLine())
	    System.out.println(filescan.nextLine());
	filescan.close();
 }
}