Похоже не понимаю условие
package com.javarush.task.task19.task1906;
/*
Четные символы
*/
import java.io.*;
import java.util.ArrayList;
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName = reader.readLine();
String fileName1 = reader.readLine();
BufferedReader fileReader = new BufferedReader(new FileReader(fileName));
FileWriter fileWriter = new FileWriter(fileName1, true);
ArrayList<Integer> arr = new ArrayList<>();
while (fileReader.ready()){
int data = fileReader.read();
arr.add(data);
}
for (int i = 0; i < arr.size(); i++){
if ((i + 1) % 2 == 0){
fileWriter.write(arr.get(i));
}
}
reader.close();
fileReader.close();
fileWriter.close();
}
}