Почему-то не проходит 3 пункт.
Исходный файл такого плана : aaaavvvvpppprrrhyg.
Все работает.
package com.javarush.task.task18.task1803;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.*;
/*
Самые частые байты
*/
public class Solution {
private static ArrayList<Integer> listOfBytes = new ArrayList<>();
private static Set<Integer> setOfBytes = new HashSet<>();
private static Map<Integer, Integer> mapOfBytes = new HashMap<>();
private static ArrayList<Integer> listOfValues = new ArrayList<>();
private static ArrayList<Integer> getListOfKeys = new ArrayList<>();
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileInputStream inputStream = new FileInputStream(reader.readLine());
while (inputStream.available() > 0) {
int a = inputStream.read();
listOfBytes.add(a);
}
inputStream.close();
for (Integer i :
listOfBytes) {
setOfBytes.add(i);
}
for (Integer a : setOfBytes) {
int count = Collections.frequency(listOfBytes, a);
mapOfBytes.put(a, count);
}
/*
for (var pair : mapOfBytes.entrySet()) {
System.out.println(pair.getKey() + " " + pair.getValue());
}
*/
for (Integer a : mapOfBytes.values()) {
listOfValues.add(a);
}
Collections.sort(listOfValues);
for (Integer a :
mapOfBytes.keySet()) {
if (mapOfBytes.get(a) == listOfValues.get(listOfValues.size() - 1)) {
getListOfKeys.add(a);
}
}
for (Integer a :
getListOfKeys) {
System.out.print(a + " ");
}
}
}