Как то так, хз, в чем проблема
package com.javarush.task.task22.task2207;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.Buffer;
import java.util.LinkedList;
import java.util.List;
/*
Обращенные слова
*/
public class Solution {
public static List<Pair> result = new LinkedList<>();
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName = reader.readLine();
reader.close();
BufferedReader reader1 = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));
String[] arr = reader1.readLine().split(" ");
for (int i = 0; i < arr.length; i++)
{
StringBuilder stringBuilder = new StringBuilder(arr[i]);
stringBuilder.reverse();
arr[i] = "";
for (int j = 0; j < arr.length; j++)
{
if (!(arr[j].equals("")))
{
if (stringBuilder.toString().equals(new StringBuilder(arr[j]).toString()))
{
Pair pair = new Pair();
pair.first = stringBuilder.reverse().toString();
pair.second = arr[j];
result.add(pair);
arr[j] = "";
break;
}
}
}
}
}
public static class Pair {
String first;
String second;
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Pair pair = (Pair) o;
if (first != null ? !first.equals(pair.first) : pair.first != null) return false;
return second != null ? second.equals(pair.second) : pair.second == null;
}
@Override
public int hashCode() {
int result = first != null ? first.hashCode() : 0;
result = 31 * result + (second != null ? second.hashCode() : 0);
return result;
}
@Override
public String toString() {
return first == null && second == null ? "" :
first == null ? second :
second == null ? first :
first.compareTo(second) < 0 ? first + " " + second : second + " " + first;
}
}
}