Comapring lines between 2 files

Question

In this program I have to compare two each line of two files and output them to the screen if they are different. I believe I should use compareTo here but I don't understand how. I would appreciate any help (the files are loaded through the internet). Thank you.
import java.util.*;
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;
public class FileComparer
public static void main (String[] args)
String line, file="http://condor.depaul.edu/~jpetlick/extra/224/display.txt";
String line2, file2="http://condor.depaul.edu/~jpetlick/extra/224/display2.txt";
int lineCount = 0, wordCount = 0, lineCounter = 0;
try
URL URLfile = new URL (file);
InputStream input = URLfile.openStream();
BufferedReader buffer = new BufferedReader(new InputStreamReader(input));
line = buffer.readLine();
URL URLfile2 = new URL (file2);
InputStream input2 = URLfile2.openStream();
BufferedReader buffer2 = new BufferedReader(new InputStreamReader(input2));
line2 = buffer2.readLine();
while (line != null)
if (line != line2)
System.out.println("at Line " + lineCounter);
System.out.println("DISPLAY.TXT " + line);
System.out.println("DISPLAY2.TXT " + line2);
lineCounter++;
StringTokenizer st = new StringTokenizer(line);
wordCount += st.countTokens();
lineCount++;
line = buffer.readLine();
line2 = buffer2.readLine();
System.out.println("\nA total of " + lineCounter + " were different between DISPLAY.TXT and DISPLAY2.TXT");
System.out.println("DISPLAY.TXT contains:");
System.out.println("\nTotal number of lines: " + lineCount);
System.out.println("Total number of words: " + wordCount);
catch (FileNotFoundException exception)
System.out.println("The file " + file + " was not found.");
catch (IOException exception)
System.out.println(exception);
}

Answer 1

A quick glance at your code tells me that you are using the wrong operator to compare two strings.
== and != will compare the two OBJECTS, and find them to be not the same object.
Try
if (!line.equals(line2))
You might also explore - depending on the requirments:
if (!line.equalsIgnorCase(line2))