CSV File operation

CsvOperations

package com.sample;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

public class CsvOperations {

    public static void sort(String filepath) throws IOException {
        // Fetch the the first line from a file
        List<String> lines = Files.lines(Paths.get(filepath)).collect(Collectors.toList());

        // Store the first line as it is from the file as its just a header
        String firstLine = lines.get(0);

        // Remove the first line as already stored
        lines.remove(0);

        // Sort the lines with the list
        lines.sort(new Comparator<String>() {
            @Override
            public int compare(String currentLine, String nextLine) {
                // Split the lines with comma separator
                String[] currLineWords = currentLine.split(",");
                String[] nextLineWords = nextLine.split(",");
                // Compare first line word with second line word in their respective cell position in the CSV
                for (int index = 0; index < currLineWords.length; index++) {
                    // Compare cells in the respective position, if not same rearrange the lines
                    int comparison = currLineWords[index].compareTo(nextLineWords[index]);
                    if (comparison != 0) {
                        return comparison;
                    }
                }
                return 0;
            }

        });

        // Extract directory location from file path
        String directory = filepath.substring(0, filepath.lastIndexOf(File.separator));
        // Append _sorted to the file
        String fileName = filepath.replace(directory + File.separator, "").replace(".", "_sorted.");
        // Write the sorted file in the same location (here using try with resource to close the writer once the write operation successful)
        try (FileWriter writer = new FileWriter(new File(directory + File.separator + fileName))) {
            // Write first line as it is
            writer.write(firstLine);

            // Iterate each line and write to the file
            lines.forEach(line -> {
                try {
                    writer.write("\n");
                    writer.write(String.join(",", line));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
        }
    }

    public static void main(String[] args) throws IOException {
        String filePath = "C:\\PARAMESH\\Interns\\Workspace\\Samples\\src\\com\\sample\\sample.csv";

        sort(filePath);
    }

}