Question

2. Write a program to read two lists of names from two input files and then match the names in the two lists using Co-sequential Match based on a single loop. Output the names common to both the lists to an output file,

In Java

Answer 1

Thanks for the question, When you run the program please ensure you update the input file names and output file name in the commented section below


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import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class CoSequentialMatch {

    public static void main(String[] args) {
        // first file path and name
        String firstFile = "names.txt";
        // second file path and name
        String secondFile = "names_ (2).txt";
        ArrayList<String> firstFileNames = getNamesFromFile(firstFile);
        ArrayList<String> secondFileNames = getNamesFromFile(secondFile);

        int minSize = firstFileNames.size() < secondFileNames.size() ?
                firstFileNames.size() : secondFileNames.size();

        // output file path and name
        String outputFile = "common-names.txt";
        try {
            FileWriter writer = new FileWriter(new File(outputFile));
            for (int i = 0; i < minSize; i++) {
                if (firstFileNames.get(i).equalsIgnoreCase(secondFileNames.get(i))) {
                    writer.write(firstFileNames.get(i) + "\r\n");
                }
            }
            writer.close();
            System.out.println(outputFile+" generated successfully.");
        } catch (IOException e) {
            System.out.println("Error: Uanble to open/write data to file: " + outputFile);
            System.exit(1);
        }
    }

    private static ArrayList<String> getNamesFromFile(String fileName) {

        ArrayList<String> data = new ArrayList<>();
        try {
            Scanner scanner = new Scanner(new File(fileName));
            while (scanner.hasNextLine()) {
                data.add(scanner.nextLine());
            }
            scanner.close();
        } catch (FileNotFoundException e) {
            System.out.println("Error: Unable to find/read file: " + fileName);
            System.exit(1);

        }
        return data;
    }
}

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