please what's wrong with this code !!!???
package com.codegym.task.task18.task1804;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
/*
Rarest bytes
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)) ;
FileInputStream read_file = new FileInputStream(reader.readLine());
SortedSet<Integer> set = new TreeSet<Integer>();
HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
int bit ,value,highest = 0;
while(read_file.available() > 0){
bit = read_file.read();
value =map.get(bit);
if( map.containsKey(bit)){
map.put(bit,map.get(bit)+1);
}
else {
map.put(bit,1);
}
}
read_file.close();
Set<Integer> set1 = (Set) map.values();
for(int bite : set1){
set.add(bite);
}
}
}