Обработка csv файла на Java

gistfile1.txt

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Calendar;

import au.com.bytecode.opencsv.CSVReader;
import au.com.bytecode.opencsv.CSVWriter;

public class Main {

	public static void main(String[] args) throws IOException {
	    
		if (args.length != 2) {
	    	System.out.println("Specify input and output files");
	    	return;
	    }
		
		CSVReader reader = new CSVReader(new FileReader(args[0]), '\t');
	    CSVWriter writer = new CSVWriter(new FileWriter(args[1]), '\t', CSVWriter.NO_QUOTE_CHARACTER);
	    
		long begin = Calendar.getInstance().getTimeInMillis();
	    
	    String[] nextLine;
	    while ((nextLine = reader.readNext()) != null) {
		    for (int i = 0; i < nextLine.length / 2; i++) {
		    	int j = nextLine.length - 1 - i;
		    	String temp = nextLine[i];
		    	nextLine[i] = nextLine[j];
		    	nextLine[j] = temp;
	    	}
	    	writer.writeNext(nextLine);
	    }

	    System.out.println((Calendar.getInstance().getTimeInMillis() - begin)/1000);
	    
		writer.close();
	}
}