Answer to Question #261972 in Java | JSP | JSF for ...

Question

Stream operation

Define a POJO class Country with countryId and CountryName as member variables

- Define a POJO class Player with playerName, matchesPlayed, runs, highestScore, Country as member variables

- Create a class StreamOperationsExercise as below

- Create a List of Players, as a static variable, with some player objects

Define following static methods and provide the implementation using Java 8 streams API as given below

- displayPlayersForCountry(String country)

Display the name of players whose highest score is more than 100 and belong to a particular country

- getPlayerNames

Return a LinkedList containing names of all Players, whose have scored more than 5000 runs, sorted in descending order of names

- getAverageRunsByCountry(String country)

Return the average runs scored by players from a particular Country

- getPlayerNamesSorted

Return a list with names of Players sorted as per country and then by matchesPlayed(descending)

Execute the above methods in the main method.

Answer 1

class Country {
  private int countryId;
  private String countryName;
  Country(int a, String b) {
    countryId = a;
    countryName = b;
  }
}
class Player {
  private String playerName;
  private int matchedPlayed;
  private int runs;
  private double highestScore;
  private Country country;
  Player (String a, int b, int c, double d, Country e) {
    playerName = a;
    matchedPlayed = b;
    runs = c;
    highestScore = d;
    country = e;
  }
}
class StreamOperationsExercise {
  private static List<Player> players = new ArrayList<Player>() {
    new Playes("a", 3, 45, 43.45, new Country(2334, "Tajikistan"))
  };
  void displayPlayersForCountry(String country) {
    StreamOperationsExercise.players.stream()
                            .filter(p -> p.country.countryName.equals(country))
                            .forEach(p -> System.out.println(p));
  }
}