Merge

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Merge {

    public static void main(String[] args) {

        // create String variables to store the filepaths to get files later
        // using relative path because I placed them in the src folder
        String fileOnePath = "src/Indiegogo002_2020-12-18.csv";
        String fileTwoPath = "src/Indiegogo002_2021-01-15.csv";

        // create String variable to establish what directory to put the merged file in
        String mergedFilePath = "src/Indiegogo002_merged_files";

        // creating an array called csvFiles that has a capacity of two
        // the first index of csvFiles [0] stores the first file from the fileOnePath
        // the second index of csvFiles [1] stores the second file from the fileTwoPath
        File[] csvFiles = new File[2];
        csvFiles[0] = new File(fileOnePath);
        csvFiles[1] = new File(fileTwoPath);

        // create a new file for the merged Files
        File mergedFile = new File(mergedFilePath);

        // calling my mergeFiles method to combine the files in the csvFiles array and create a new file
        mergeFiles(csvFiles, mergedFile);

        // using regex Pattern and Matcher to find keywords
        Pattern p = Pattern.compile("Games", Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher("Video Games");
        boolean matchFound = m.find();

        if (matchFound) {
            System.out.println("Match found");
        } else {
            System.out.println("Match not found.");
        }

    } // end of main class

    public static void mergeFiles(File[] files, File mergedFile) {

        // create FileWriter and BufferedWriter set to null so assigning what they write to can be done in try/catch block
        FileWriter csvData = null;
        // the BufferedWriter makes FileWriter more efficient because it writes large amounts of data at once
        BufferedWriter out = null;

        // the try block creates a FileWriter so that what the FileWriter writes to the mergedFile is appended to csvData
        try {
            csvData = new FileWriter(mergedFile, true);
            out = new BufferedWriter(csvData);
        } catch (IOException e) {
            e.printStackTrace();
        }

        // use for loop to iterate over csv files
        for (File indieGoGoCsv:files) {
            System.out.println("Merging: " + indieGoGoCsv.getName());
            FileInputStream inputStream;
            try {
                inputStream = new FileInputStream(indieGoGoCsv);
                BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));

                String aLine;
                while ((aLine = in.readLine()) != null) {
                    out.write(aLine);
                    out.newLine();
                }
                in.close();
            } catch (IOException x) {
                x.printStackTrace();
            }
        } // end of for loop

        try {
            out.close();
        } catch (IOException x) {
            x.printStackTrace();
        }
    } // end of mergeFiles

} // end of Merge class