ЭЭм... И где бесконечный цикл?
package com.javarush.task.task18.task1805;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.Set;
import java.util.TreeSet;
/*
Сортировка байт
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String s = reader.readLine();
FileInputStream inputStream = new FileInputStream(s);
Set<Integer> set = new TreeSet<>();
int readByte = 0;
while(inputStream.available()>0){
set.add(readByte);
}
for (Integer x : set ) {
System.out.print(x+" ");
}
reader.close();
inputStream.close();
}
}