Comparing two files

package edu.scjp.files;

import java.io.*;

public class CompareFiles {

        public static void main(String[] args) throws IOException {

                // File names to Read & Write.

                String actualFile   = "C:\\view\\test1.txt";

                String expectedFile = "C:\\view\\test2.txt";

                String descptnFile  = "C:\\view\\test3.txt";

                try{

                // Create FileReader & Writer Objects.

                FileReader actualFileReader  = new FileReader(actualFile);

                FileReader expctdFileReader  = new FileReader(expectedFile);

                FileWriter resultDesc = new FileWriter(descptnFile);

              

                // Create Buffered Object.

                BufferedReader actlFileBufRdr = new BufferedReader(actualFileReader);

                BufferedReader expcFileBufRdr = new BufferedReader(expctdFileReader);

                BufferedWriter resultFileBufWrtr = new BufferedWriter(resultDesc);

              

                // Get the file contents into String Variables.

                String actlFileContent = actlFileBufRdr.readLine();

                String expctdFileContent = expcFileBufRdr.readLine();

              

                // Compare the Contents of the files.

                String startOfComparision = "---------START----------";

                resultFileBufWrtr.write(startOfComparision);

                resultFileBufWrtr.newLine();

                System.out.println(startOfComparision);

              

                boolean isDifferent = false;

                int lineNumber = 1;

              

                if (actlFileContent != null || expctdFileContent != null) {

                      

                        // Check whether Actual file contains data or not

                        while((actlFileContent!=null)  ){

                              

                                // Check whether Expected file contains data or not

                                if (((expctdFileContent )!=null)) {

                                      

                                        // Check whether both the files have same data in the lines

                                        if (!actlFileContent.equals(expctdFileContent)) {

                                                resultFileBufWrtr.write("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains : "+expctdFileContent);

                                                resultFileBufWrtr.newLine();

                                                System.out.println("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains : "+expctdFileContent);

                                                isDifferent = true;

                                        }

                                        lineNumber = lineNumber+1;

                                        expctdFileContent= expcFileBufRdr.readLine();

                                }

                                else{

                                        resultFileBufWrtr.write("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains - "+expctdFileContent);

                                        resultFileBufWrtr.newLine();

                                        System.out.println("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains - "+expctdFileContent);

                                        isDifferent = true;

                                        lineNumber = lineNumber+1;

                                }

                                actlFileContent=actlFileBufRdr.readLine();

                        }

                      

                        // Check for the condition : if Actual File has Data & Expected File doesn't contain data.

                        while ((expctdFileContent!=null)&&(actlFileContent==null)) {

                                resultFileBufWrtr.write("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains - "+expctdFileContent);

                                resultFileBufWrtr.newLine();

                                System.out.println("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains - "+expctdFileContent);

                                isDifferent = true;

                                lineNumber = lineNumber+1;

                                expctdFileContent= expcFileBufRdr.readLine();

                        }

                }

                else{

                        // Mention that both the files don't have Data.

                        resultFileBufWrtr.write("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains - "+expctdFileContent);

                        resultFileBufWrtr.newLine();

                        System.out.println("Difference in Line "+lineNumber+" :- Actual File contains :"+actlFileContent+", Expected File Contains - "+expctdFileContent);

                        isDifferent = true;

                }

              

                // Check is there any difference or not.

                String endOfComparision = "-----------END----------";

                if (isDifferent) {

                        resultFileBufWrtr.append(endOfComparision);

                        System.out.println(endOfComparision);

                }

                else{

                        resultFileBufWrtr.append("No difference Found");

                        resultFileBufWrtr.newLine();

                        resultFileBufWrtr.append(endOfComparision);

                      

                        System.out.println("No difference Found");

                        System.out.println(endOfComparision);

                }

              

                //Close the streams.

                actualFileReader.close();

                expctdFileReader.close();

                resultFileBufWrtr.close();

                actlFileBufRdr.close();

                expcFileBufRdr.close();

          }

          catch( FileNotFoundException e )

        {

                        e.printStackTrace();

        }             

        }

}