I need help, been stuck for hours and I cant understand how to do this task
package com.codegym.task.task18.task1802;
import java.io.FileInputStream;
import java.io.BufferedReader;
import java.io.*;
/*
Minimum byte
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileInputStream test = new FileInputStream(reader.readLine());
Integer i= Integer.MAX_VALUE;
while(test.available() < 0){
Integer min = test.read();
if(min < i){
i = min;
}
}
test.close();
System.out.println(i);
}
}