MyScanFile

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

// MyScanFile reads to different files and prints the line number and the line at which the two files differ.

public class MyScanFile {

// Main method reads two given file names and passes the scanners
// to method differences().

	public static void main (String[] args) throws FileNotFoundException {
	System.out.println("Enter name of File 1: ");
	Scanner console = new Scanner(System.in);		
	String fileName1 = console.next();
	System.out.println("Enter name of File 2: ");
	String fileName2 = console.next();		
	Scanner input1 = new Scanner(new File(fileName1));
	Scanner input2 = new Scanner(new File(fileName2)); 
	System.out.println("Differences found:");
	differences(input1, input2); 
	}
	
	// The method differences() compares each line of the files to eachother.
	// If a difference is found, the line numbers and lines are printed.
	
	public static void differences(Scanner input1, Scanner input2) {
	int lineCounter = 1; //line number
	while (input1.hasNextLine() && input2.hasNextLine()) {   
		String sameLine1 = input1.nextLine();
		String sameLine2 = input2.nextLine();
		if (!sameLine1.equals(sameLine2)) {
			System.out.println("Line" + lineCounter + ":\n< " + sameLine1 + "\n> " + sameLine2); //prints line when different
		}
		lineCounter++;
	}
	}
}