Как правильно?
package com.javarush.task.task19.task1919;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class Solution {
public static void main(String[] args) throws IOException {
Map <String, Integer> map = new HashMap<>();
BufferedReader fileReader= new BufferedReader(new FileReader(args[0]));
while(fileReader.ready()){
String[] buffer = fileReader.readLine().split(" ");
String bufKey = buffer[0];
int bufVal = Integer.parseInt(buffer[1]);
map.merge(bufKey, bufVal, (oldVal, newVal) -> oldVal + newVal);
}
fileReader.close();
map.forEach((k,v) -> System.out.println(k + " " + v));
}
}