Господа, чего валидатор негодуэ?
package com.javarush.task.task18.task1822;
/*
Поиск данных внутри файла
*/
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
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());
reader.close();
StringBuilder strBld = new StringBuilder();
while (inputStream.available() > 0) strBld.append((char) inputStream.read());
inputStream.close();
int id = Integer.parseInt(args[0]);
String[] products = strBld.toString().split("\n");
for (String x : products) if (x.startsWith(id + " ")) System.out.println(x);
}
}