Подчеркивается character в 17 строчке. Что не так?
package com.javarush.task.task18.task1807;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
/*
Подсчет запятых
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileInputStream inputStream = new FileInputStream(reader.readLine());
int character;
int counter = 0;
while (inputStream.available() > 0) {
if (character == ',') {
counter++;
}
}
inputStream.close();
System.out.println(counter);
}
}