Übungen

Programmierung2/src/Testate/Stream/Country.java

@@ -0,0 +1,154 @@
+package Testate.Stream;
+
+import java.util.*;
+import java.util.stream.*;
+
+public class Country {
+	private String code;
+	private String name;
+	private String continent;
+	private double surfaceArea;
+	private int population;
+	private double gnp;
+	private int capital;
+	private List<City> cities;
+	{
+		cities = new ArrayList<>();
+	}
+
+	public Country(String code, String name, String continent, int population, double surfaceArea, double gnp,
+			int capital) {
+		this.code = code;
+		this.name = name;
+		this.continent = continent;
+		this.surfaceArea = surfaceArea;
+		this.population = population;
+		this.capital = capital;
+		this.gnp = gnp;
+	}
+
+	public String getCode() {
+		return code;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public String getContinent() {
+		return continent;
+	}
+
+	public double getSurfaceArea() {
+		return surfaceArea;
+	}
+
+	public double getGnp() {
+		return gnp;
+	}
+
+	public int getCapital() {
+		return capital;
+	}
+
+	public void setPopulation(int population) {
+		this.population = population;
+	}
+
+	public List<City> getCities() {
+		return cities;
+	}
+
+	@Override
+	public String toString() {
+		return "Country [ name=" + name + ", population=" + population + "]";
+	}
+	
+	
+	public static void main(String[] args) {
+	    // Städte
+	    City city1 = new City(1, "Berlin", "DE", 3769000);
+	    City city2 = new City(2, "Hamburg", "DE", 1841000);
+	    City city3 = new City(3, "Munich", "DE", 1472000);
+	    City city4 = new City(4, "Paris", "FR", 2161000);
+	    City city5 = new City(5, "Lyon", "FR", 513000);
+	    City city6 = new City(6, "Marseille", "FR", 861000);
+	    City city7 = new City(7, "Madrid", "ES", 3223000);
+	    City city8 = new City(8, "Barcelona", "ES", 1620000);
+	    City city9 = new City(9, "New York", "US", 8419000);
+	    City city10 = new City(10, "Los Angeles", "US", 3980000);
+
+	    // Länder
+	    Country country1 = new Country("DE", "Germany", "Europe", 83100000, 357022, 38456.0, 1);
+	    country1.getCities().addAll(Arrays.asList(city1, city2, city3));
+
+	    Country country2 = new Country("FR", "France", "Europe", 67390000, 551695, 27775.0, 4);
+	    country2.getCities().addAll(Arrays.asList(city4, city5, city6));
+
+	    Country country3 = new Country("ES", "Spain", "Europe", 47350000, 505990, 12345.0, 7);
+	    country3.getCities().addAll(Arrays.asList(city7, city8));
+
+	    Country country4 = new Country("US", "United States", "North America", 331000000, 9833517, 211375.0, 9);
+	    country4.getCities().addAll(Arrays.asList(city9, city10));
+
+	   
+
+	    // Testliste für Länder
+	    List<Country> countries = new ArrayList<>();
+	    countries.add(country1);
+	    countries.add(country2);
+	    countries.add(country3);
+	    countries.add(country4);
+	   
+	    
+//		Map<Country,List<City>> a2 = countries.stream()
+//				.collect(Collectors.toMap(c -> c, ci -> ci.getCities()));
+		
+		Map<Country,City> a2_2 = countries.stream()
+				.collect(Collectors.toMap(c -> c,
+						c -> c.getCities().stream()
+						.max(Comparator.comparingInt(city -> city.getPopulation()))
+						.orElse(null)
+						));
+		
+		a2_2.forEach((a,b) -> System.out.println( a + " " + b));
+	}
+
+}
+
+class City {
+	private int id;
+	private String name;
+	private int population;
+	private String countryCode;
+
+	public City(int id, String name, String countryCode, int population) {
+		this.id = id;
+		this.name = name;
+		this.population = population;
+		this.countryCode = countryCode;
+	}
+
+	public int getId() {
+		return id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public int getPopulation() {
+		return population;
+	}
+
+	public String getCountryCode() {
+		return countryCode;
+	}
+
+	@Override
+	public String toString() {
+		return "City [id=" + id + ", name=" + name + ", population=" + population + ", countryCode=" + countryCode
+				+ "]";
+	};
+
+}

Programmierung2/src/Testate/Stream/Movie.java

@@ -1,14 +1,7 @@
 package Testate.Stream;
-
-import static java.util.Map.Entry.comparingByValue;
-import static java.util.stream.Collectors.counting;
-import static java.util.stream.Collectors.groupingBy;
-
 import java.util.*;
 import java.util.stream.Collectors;
 
-
-
 public class Movie {
     private int id;
     private String title;
@@ -90,32 +83,12 @@ public class Movie {
 		movies.add(movie1);
 		movies.add(movie2);
 		movies.add(movie3);
-		//movies.forEach(System.out::println);
-		
-		//Finde die Anzahl der Filme jedes Regisseurs.
-		Map<String,Long> anzahl = movies.stream()
-				.flatMap(s -> s.getDirectors().stream())
-				.map(r -> r.getName())
-				.collect(Collectors.groupingBy(name -> name, Collectors.counting()));
-		//anzahl.forEach((a,b) -> System.out.println(a + " " +b));
-		
-		//Finde die Liste der Filme, die nur die Genres "Drama" und "Komödie" haben.
-		
-		List<Movie> aufgabe7 = movies.stream()
-				.filter(f -> f.getGenres().stream().anyMatch(fil -> fil.getName().equalsIgnoreCase("Drama")))
-				.collect(Collectors.toCollection(ArrayList::new));
-		
-	//	System.out.println(aufgabe7);
-		
-		 var maxMovieCountByYear = 
-		          movies.stream()
-		                .collect(groupingBy(Movie::getYear,counting()))
-		        		.entrySet()
-		        		.stream()
-		        		.max(comparingByValue());
-		        maxMovieCountByYear.ifPresent(System.out::println);
-						
 		
+		//1. Finde die Anzahl der Filme jedes Regisseurs.
+		Map<String,Long> a1 = movies.stream()
+				.flatMap(m -> m.getDirectors().stream())
+				.collect(Collectors.groupingBy(name -> name.getName(),Collectors.counting()));
+		a1.forEach((a,b) -> System.out.println(a + " " + b));
 	}
 }