Ejercicios Arrays

src/main/java/com/oracle/arrays/impl/MultidimensionalImpl.java

@@ -6,11 +6,21 @@
 public class MultidimensionalImpl implements Multidimensional {
     @Override
     public Posicion getPosition(String[][] datos, String dato) {
+        for(int i=0;i< datos.length;i++){
+            int j=0;
+            while(j<datos[i].length){
+                if(datos[i][j].equals(dato)){
+                    return new Posicion(i,j);
+                }
+                j+=1;
+            }
+        }
         return null;
     }
 
     @Override
     public String getData(String[][] datos, Posicion posicion) {
-        return null;
+        return datos[posicion.getX()][posicion.getY()];
     }
 }
+

src/main/java/com/oracle/arrays/impl/UnidimensionalImpl.java

@@ -5,10 +5,36 @@
 public class UnidimensionalImpl implements Unidimensional {
     @Override
     public void ordenamiento(int[] arr) {
+        boolean flag=false;
+        while(!flag){
+            flag=true;
+            for(int i=0;i<arr.length-1;i++){
+                if(arr[i]>arr[i+1]){
+                    int a=arr[i];
+                    int b=arr[i+1];
+                    arr[i+1]=a;
+                    arr[i]=b;
+                    flag=false;
+                }
+            }
+        }
     }
 
     @Override
     public int[] ordenamientoReversa(int[] arr) {
-        return null;
+        boolean flag=false;
+        while(!flag){
+            flag=true;
+            for(int i=0;i<arr.length-1;i++){
+                if(arr[i]<arr[i+1]){
+                    int a=arr[i];
+                    int b=arr[i+1];
+                    arr[i+1]=a;
+                    arr[i]=b;
+                    flag=false;
+                }
+            }
+        }
+        return arr;
     }
 }

src/main/java/com/oracle/stream/CountriesAndCities.java

@@ -3,12 +3,19 @@
 import com.oracle.dao.CityDao;
 import com.oracle.dao.CountryDao;
 import com.oracle.dao.InMemoryWorldDao;
+import com.oracle.domain.City;
+import com.oracle.domain.Country;
+
+import java.util.*;
+import java.util.stream.Collectors;
 
 public class CountriesAndCities {
     private static final CountryDao countryDao = InMemoryWorldDao.getInstance();
     private static final CityDao cityDao = InMemoryWorldDao.getInstance();
 
     public static void main(String[] args) {
         // Encontrar las ciudades mas pobladas en cada continente
+        Map<String, Optional<City>> ciudadesMasPobladas = cityDao.findAllCities().stream().collect(Collectors.groupingBy(city -> countryDao.findCountryByCode(city.getCountryCode()).getContinent(),Collectors.maxBy(Comparator.comparingInt(City::getPopulation))));
+        ciudadesMasPobladas.entrySet().forEach(System.out::println);
     }
 }

src/main/java/com/oracle/stream/StreamEjemplo.java

@@ -16,9 +16,9 @@ public static void main(String[] args) {
         personList.add(new Person("Alisa", 7900, 26, "female", "New York"));
 
         // Crear una nueva persona y agregarla a la lista
-        List<Person> personList2 = personList.stream().map().collect(Collectors.toList());
+        //List<Person> personList2 = personList.stream().map().collect(Collectors.toList());
         // Convertir km a millas
-        List<Person> personList3 = personList2.stream().map().collect(Collectors.toList());
+        List<Person> personList3 = personList.stream().map(person -> {person.setKmPerYear((int)(person.getKmPerYear()*0.621371)); return person;}).peek(person -> System.out.println(person.getKmPerYear())).collect(Collectors.toList());
     }
 }
 
@@ -29,6 +29,14 @@ class Person {
     private String genre;
     private String city;
 
+    public int getKmPerYear() {
+        return kmPerYear;
+    }
+
+    public void setKmPerYear(int kmPerYear) {
+        this.kmPerYear = kmPerYear;
+    }
+
     public Person(String name, int kmPerYear, int age, String genre, String city) {
         this.name = name;
         this.kmPerYear = kmPerYear;