ExercicioMap.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.*;
import java.util.stream.Collectors;

public class ExercicioMap {

    public static void main(String[] args) {
        ArrayList<List<String>> csv = new ArrayList<>();
        for(String line : readFile()){
            csv.add(Arrays.asList(line.split(",")));
        }

        Set<String> locaisVisitados = new HashSet<>();
        for(List<String> line : csv){
            locaisVisitados.add(line.get(0));
        }

        Map<String, Double> dinheiroGasto = new HashMap<>();
        for(List<String> line : csv){
            if(!dinheiroGasto.containsKey(line.get(0))){
                dinheiroGasto.put(line.get(0), Double.parseDouble(line.get(3)));
            } else {
                dinheiroGasto.put(line.get(0), dinheiroGasto.get(line.get(0))+Double.parseDouble(line.get(3)));
            }
        }

        System.out.printf("Locais Visitados: %s\n", locaisVisitados);
        System.out.printf("Dinheiro Gasto: %s", dinheiroGasto);
    }

    public static String[] readFile() {
        try {
            BufferedReader br = new BufferedReader(new FileReader("viagens.csv"));
            return br.lines().collect(Collectors.toList()).toArray(new String[0]);
        } catch (Exception ex){
            ex.printStackTrace();
        }
        return null;
    }
}

ExercicioMap.kt

import java.io.BufferedReader
import java.io.FileReader
import kotlin.streams.toList

fun main(args: Array<String>) {
    BufferedReader(FileReader("viagens.csv")).lines().map { it.split(",") }.toList()
        .let { csv ->
            csv.map { it[0] }.toSet().also { println("Locais Visitados: $it") }
            mutableMapOf<String, Double>().also { map ->
                csv.forEach {
                    map[it[0]] = (map[it[0]] ?: 0.0) + it[3].toDouble()
                }
            }.also { println("Dinheiro Gasto: $it") }
        }
}

viagens.csv