Java Code to merge two files

Problem:

Design and implement a merging  algorithm that reads the data sets from two files of known length.


Solution:

package array.programs;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class MergeTwoFiles {

File file1;
File file2;
File resultFile;

List<String> firstFileData = new ArrayList<String>();
List<String> secondFileData = new ArrayList<String>();

public static void main(String[] args) throws IOException {
MergeTwoFiles mergeTwoFiles = new MergeTwoFiles();
mergeTwoFiles.mergeFiles();
}

public void mergeFiles() throws IOException{
file1 = new File("D:\\hemanth\\DS&Al\\Programs\\src\\array\\programs\\file1.txt");
file2 = new File("D:\\hemanth\\DS&Al\\Programs\\src\\array\\programs\\file2.txt");
resultFile = new File("D:\\hemanth\\DS&Al\\Programs\\src\\array\\programs\\resultFile.txt");

FileReader fileReader = new FileReader(file1);
BufferedReader bufferedReader = new BufferedReader(fileReader);
String data;
while ((data = bufferedReader.readLine()) != null) {
firstFileData.add(data);
}

fileReader = new FileReader(file2);
bufferedReader = new BufferedReader(fileReader);

while ((data = bufferedReader.readLine()) != null) {
secondFileData.add(data);
}

FileWriter fileWriter = new FileWriter(resultFile);
BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
for(String str: firstFileData){
bufferedWriter.write(str);
bufferedWriter.write("\n");
}

for(String str: secondFileData){
bufferedWriter.write(str);
bufferedWriter.write("\n");
}
bufferedReader.close();
bufferedWriter.close();
}

}