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Correction Exo streams-adv #16

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Correction Exo streams-adv #16

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17 changes: 9 additions & 8 deletions src/test/java/java17/ex01/Stream_01_Test.java
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@

import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

import org.junit.Test;

Expand All @@ -28,7 +29,7 @@ public void test_stream_filter() throws Exception {
List<Pizza> pizzas = new Data().getPizzas();

// TODO récupérer la liste des pizzas dont le prix est >= 1300
List<Pizza> result = null;
List<Pizza> result = pizzas.stream().filter(p -> p.getPrice() >= 1300).toList();

assertThat(result, hasSize(3));
assertThat(result, everyItem(hasProperty("price", anyOf(equalTo(1300), greaterThan(1300)))));
Expand All @@ -39,7 +40,7 @@ public void test_stream_filter_count() throws Exception {
List<Pizza> pizzas = new Data().getPizzas();

// TODO compter le nombre de pizzas dont le prix est >= 1300
long result = 0L;
long result = pizzas.stream().filter(p->p.getPrice() >= 1300).count();

assertThat(result, is(3L));
}
Expand All @@ -50,10 +51,10 @@ public void test_stream_anyMatch() throws Exception {
List<Pizza> pizzas = new Data().getPizzas();

// TODO valider si au moins une pizza à un prix >= 1300
Boolean result1 = null;
Boolean result1 = pizzas.stream().anyMatch(p->p.getPrice() >= 1300);

// TODO valider si au moins une pizza à un prix >= 2000
Boolean result2 = null;
Boolean result2 = pizzas.stream().anyMatch(p->p.getPrice() >= 2000);;

assertThat(result1, is(true));
assertThat(result2, is(false));
Expand All @@ -65,10 +66,10 @@ public void test_stream_allMatch() throws Exception {
List<Pizza> pizzas = new Data().getPizzas();

// TODO valider que toutes les pizzas ont un prix >= 1300
Boolean result1 = null;
Boolean result1 = pizzas.stream().allMatch(p->p.getPrice() >= 1300);

// TODO valider que toutes les pizzas ont un prix >= 900
Boolean result2 = null;
Boolean result2 = pizzas.stream().allMatch(p->p.getPrice() >= 900);;

assertThat(result1, is(false));
assertThat(result2, is(true));
Expand All @@ -80,7 +81,7 @@ public void test_stream_noneMatch() throws Exception {
List<Pizza> pizzas = new Data().getPizzas();

// TODO valider qu'aucune pizza n'a un prix >= 2000
Boolean result1 = null;
Boolean result1 = pizzas.stream().noneMatch(p->p.getPrice() >= 2000);

assertThat(result1, is(true));
}
Expand All @@ -90,7 +91,7 @@ public void test_stream_findFirst() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO récupérer une commande faite par un client dont le prénom est "Sophie"
Optional<Order> result = null;
Optional<Order> result = orders.stream().filter(o->o.getCustomer().getFirstname().equals("Sophie")).findFirst();

assertThat(result.isPresent(), is(false));
}
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13 changes: 7 additions & 6 deletions src/test/java/java17/ex02/Stream_02_Test.java
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Expand Up @@ -6,6 +6,7 @@

import java.util.List;
import java.util.OptionalDouble;
import java.util.stream.Collectors;

import org.junit.Test;

Expand All @@ -24,7 +25,7 @@ public void test_map() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Trouver la liste des clients associés aux commandes
List<Customer> result = null;
List<Customer> result = orders.stream().map(o->o.getCustomer()).toList();

assertThat(result, hasSize(8));
}
Expand All @@ -35,7 +36,7 @@ public void test_map_count() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Compter le nombre de clients associés aux commandes
long result = 0;
long result = orders.stream().map(o->o.getCustomer()).count();

assertThat(result, is(8L));
}
Expand All @@ -46,7 +47,7 @@ public void test_map_distinct() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Trouver la liste des différents clients associés aux commandes (sans doublon)
List<Customer> result = null;
List<Customer> result = orders.stream().map(o->o.getCustomer()).distinct().toList();

assertThat(result, hasSize(2));
}
Expand All @@ -57,7 +58,7 @@ public void test_map_distinct_count() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Compter le nombre des différents clients associés aux commandes
long result = 0L;
long result = orders.stream().map(o->o.getCustomer()).distinct().count();

assertThat(result, is(2L));
}
Expand All @@ -71,7 +72,7 @@ public void test_mapToDouble_sum() throws Exception {
* TODO Calculer le chiffre d'affaires total de la pizzeria (somme des prix des
* commandes)
*/
double result = 0.0;
double result = orders.stream().mapToDouble(o->o.getPrice()).sum();

assertThat(result, is(10900.0));
}
Expand All @@ -84,7 +85,7 @@ public void test_mapToDouble_avg() throws Exception {
/*
* TODO Calculer le prix moyen des commandes de la pizzeria
*/
OptionalDouble result = null;
OptionalDouble result = orders.stream().mapToDouble(o->o.getPrice()).average();

assertThat(result.isPresent(), is(true));
assertThat(result.getAsDouble(), is(1362.5));
Expand Down
29 changes: 22 additions & 7 deletions src/test/java/java17/ex03/Stream_03_Test.java
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Expand Up @@ -4,9 +4,12 @@
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collector;
import java.util.stream.Collectors;

import org.junit.Test;

Expand All @@ -26,7 +29,17 @@ public void test_max() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Retrouver la commande avec le prix le plus élevé
Optional<Order> result = null;

Comparator<Order> comparator = (Order o1, Order o2) -> {
if (o1.getPrice()>o2.getPrice()) {
return 1;
} else if (o1.getPrice()<o2.getPrice()) {
return -1;
} return 0;
};

// Comparator.comparating(x->x.getMethode)
Optional<Order> result = orders.stream().max(Comparator.comparing(o->o.getPrice()));

assertThat(result.isPresent(), is(true));
assertThat(result.get().getPrice(), is(2200.0));
Expand All @@ -38,7 +51,9 @@ public void test_min() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Retrouver la commande avec le prix le moins élevé
Optional<Order> result = null;

// cas inverse de max
Optional<Order> result = orders.stream().min(Comparator.comparing(o->o.getPrice()));

assertThat(result.isPresent(), is(true));
assertThat(result.get().getPrice(), is(1000.0));
Expand All @@ -51,7 +66,7 @@ public void test_map_collect_joining() throws Exception {

// TODO construire une chaîne contenant les prénoms des clients triés et séparés
// par le caractère "|"
String result = null;
String result = customers.stream().map(c->c.getFirstname()).sorted().collect(Collectors.joining("|"));

assertThat(result, is("Alexandra|Cyril|Johnny|Marion|Sophie"));
}
Expand All @@ -62,7 +77,7 @@ public void test_flatMap() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Extraire la liste des pizzas de toutes les commandes
List<Pizza> result = null;
List<Pizza> result = orders.stream().flatMap(o->o.getPizzas().stream()).toList();

assertThat(result.size(), is(9));
}
Expand All @@ -73,7 +88,7 @@ public void test_flatMap_distinct() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO Extraire la liste des différentes pizzas de toutes les commandes
List<Pizza> result = null;
List<Pizza> result = orders.stream().flatMap(o->o.getPizzas().stream()).distinct().toList();;

assertThat(result.size(), is(4));
}
Expand All @@ -84,7 +99,7 @@ public void test_grouping() throws Exception {
List<Order> orders = new Data().getOrders();

// TODO construire une Map <Client, Commandes effectuées par le client
Map<Customer, List<Order>> result = null;
Map<Customer, List<Order>> result = orders.stream().collect(Collectors.groupingBy(Order::getCustomer)); // Order::getMethode reviens à faire x->x.getMethode

assertThat(result.size(), is(2));
assertThat(result.get(new Customer(1)), hasSize(4));
Expand All @@ -98,7 +113,7 @@ public void test_partitionning() throws Exception {
// TODO Séparer la liste des pizzas en 2 ensembles :
// TODO true -> les pizzas dont le nom commence par "L"
// TODO false -> les autres
Map<Boolean, List<Pizza>> result = null;
Map<Boolean, List<Pizza>> result = pizzas.stream().collect(Collectors.partitioningBy(p->p.getName().charAt(0) == 'L'));

assertThat(result.get(true), hasSize(6));
assertThat(result.get(false), hasSize(2));
Expand Down
12 changes: 7 additions & 5 deletions src/test/java/java17/ex04/Stream_04_Test.java
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Expand Up @@ -16,7 +16,9 @@ public class Stream_04_Test {
@Test
public void test_of() throws Exception {
// Construire un stream permettant de rendre le test passant
Stream<String> result = null;


Stream<String> result = Stream.of("Alexandra", "Cyril", "Johnny", "Marion", "Sophie");

assertThat(result.toArray(), arrayContaining("Alexandra", "Cyril", "Johnny", "Marion", "Sophie"));
}
Expand All @@ -26,7 +28,7 @@ public void test_builder() throws Exception {

// TODO compléter pour rendre le test passant
// TODO utiliser la méthode "add"
Stream<Object> result = Stream.builder().build();
Stream<Object> result = Stream.builder().add("Alexandra").add("Cyril").add("Johnny").add("Marion").add("Sophie").build();

assertThat(result.toArray(), arrayContaining("Alexandra", "Cyril", "Johnny", "Marion", "Sophie"));
}
Expand All @@ -37,16 +39,16 @@ public void test_concat() throws Exception {
Stream<String> s2 = Stream.of("Johnny", "Marion", "Sophie");

// TODO concatener les deux streams s1 et s2
Stream<String> result = null;
Stream<String> result = Stream.concat(s1, s2);

assertThat(result.toArray(), arrayContaining("Alexandra", "Cyril", "Johnny", "Marion", "Sophie"));
}

@Test
public void test_iterate() throws Exception {
// TODO utiliser la méthode "iterate" de Stream afin de rendre le test passant
Stream<Integer> result1 = null;
Stream<Integer> result2 = null;
Stream<Integer> result1 = Stream.iterate(1, i->i).limit(5);
Stream<Integer> result2 = Stream.iterate(1, i->i+1).limit(5);
assertThat(result1.toArray(), arrayContaining(1,1,1,1,1));
assertThat(result2.toArray(), arrayContaining(1,2,3,4,5));
}
Expand Down