вывод же правильный!
package com.javarush.task.task22.task2207;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashSet;
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 br = new BufferedReader(new InputStreamReader(System.in));
String str = br.readLine();
String[] array = str.split(" ");
br.close();
for (int i = 0; i < array.length - 1; i++) {
for (int j = i + 1; j < array.length; j++) {
StringBuilder stringBuilder = new StringBuilder(array[j]);
stringBuilder.reverse();
String string = new String(stringBuilder);
if (array[i].equals(string)) {
Pair pair = new Pair();
pair.first = array[i];
pair.second = array[j];
if (result.contains(pair)) {
break;
} else {
result.add(pair);
break;
}
}
}
}
for (Pair pair : result) {
System.out.println(pair);
}
}
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 != null ? second :
second == null && first != null ? first :
first.compareTo(second) < 0 ? first + " " + second : second + " " + first;
}
}
}
