5. Write Every Third Line

package DPM;

import java.io.*;

public class Main {
    public static void main(String[] args) {
        String inputPath = "D:\\Coding\\Java\\Softuni\\Java Advanced - January 2019" +
                "\\04. Java-Advanced-Fiels-and-Directories-Lab\\04. Java-Advanced-" +
                "Files-and-Streams-Lab-Resources\\input.txt";
        String outputPath = "D:\\Coding\\Java\\Softuni\\Java Advanced - January 2019" +
                "\\04. Java-Advanced-Fiels-and-Directories-Lab\\04. Java-Advanced-" +
                "Files-and-Streams-Lab-Resources\\output.txt";

        try (BufferedReader reader = new BufferedReader(new FileReader(inputPath));
             PrintWriter writer = new PrintWriter(new FileWriter(outputPath))){
            int coutner = 1;
            String line = null;
            line = reader.readLine();
            while (line != null){
                if (coutner % 3 ==0){
                    writer.println(line);
                }
                coutner++;
                line=reader.readLine();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}