я не понимаю
package com.javarush.task.task07.task0717;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
/*
Удваиваем слова
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
ArrayList<String> list = new ArrayList<>();
ArrayList<String> result = doubleValues(list);
for (int i = 0; i < 10; i++) {
String s = reader.readLine();
list.add(s);
}
System.out.println(result);
}
public static ArrayList<String> doubleValues(ArrayList<String> list) throws IOException {
for (int i = 0; i < list.size();) {
list.add(i + 1, list.get(i));
i += 1;
break;
}
return list;
}
}