1. First query ready for all the countries in the world by population

src/main/java/com/napier/semGROUP4/menu/Menu.java

@@ -7,6 +7,7 @@
 import com.napier.semGROUP4.queriesClasses.Language;
 import com.napier.semGROUP4.services.CapitalCityService;
 import com.napier.semGROUP4.services.CityService;
+import com.napier.semGROUP4.services.CountryService;
 import com.napier.semGROUP4.services.LanguageService;
 
 /**
@@ -17,6 +18,7 @@ public class Menu {
     private final CityService cityService;
     private final CapitalCityService capitalCityService;
     private final LanguageService languageService;
+    private final CountryService countryService;
 
     /**
      * Initializes the menu with city, language, and capital city services.
@@ -27,6 +29,7 @@ public Menu(Connection con) {
         this.cityService = new CityService(con);
         this.languageService = new LanguageService(con);
         this.capitalCityService = new CapitalCityService(con);
+        this.countryService = new CountryService(con);
     }
 
     public void menuSample() {
@@ -41,7 +44,7 @@ public void menuSample() {
         Language language = languageService.getLanguage(languageName);
         System.out.println(language);
         System.out.println("---- \n");
-        System.out.println(capitalCityService.getAllCapitalsInContinent(continentName));
+        System.out.println(countryService.getAllCountriesByPop());
         System.out.println("---- \n");
         System.out.println("Exiting app...");
     }

src/main/java/com/napier/semGROUP4/queriesClasses/Country.java

@@ -1,4 +1,75 @@
 package com.napier.semGROUP4.queriesClasses;
 
 public class Country {
+
+    private String code;
+    private String name;
+    private String continent;
+    private String region;
+    private int population;
+    private String capital;
+
+    public Country() {
+
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getContinent() {
+        return continent;
+    }
+
+    public void setContinent(String continent) {
+        this.continent = continent;
+    }
+
+    public String getRegion() {
+        return region;
+    }
+
+    public void setRegion(String region) {
+        this.region = region;
+    }
+
+    public int getPopulation() {
+        return population;
+    }
+
+    public void setPopulation(int population) {
+        this.population = population;
+    }
+
+    public String getCapital() {
+        return capital;
+    }
+
+    public void setCapital(String capital) {
+        this.capital = capital;
+    }
+
+
+    @Override
+    public String toString() {
+        return """
+                Name: %s,
+                Capital: %s,
+                Continent: %s,
+                Region: %s,
+                Population: %d
+                """.formatted(this.getName(), this.getCapital(), this.getContinent(), this.getRegion(), this.getPopulation()) ;
+    }
 }

src/main/java/com/napier/semGROUP4/services/CountryService.java

@@ -1,4 +1,46 @@
 package com.napier.semGROUP4.services;
 
+import com.napier.semGROUP4.queriesClasses.Country;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+
 public class CountryService {
+    private Connection con;
+
+    public CountryService(Connection aCon) {this.con = aCon;
+    }
+
+    public ArrayList<Country> getAllCountriesByPop() {
+
+        ArrayList<Country> countriesList = new ArrayList<>();
+        try {
+            Statement stmt = con.createStatement();
+            String sql = "SELECT country.Code, country.Name, country.Continent, country.Region, country.Population, city.Name AS Capital FROM country " +
+                    "JOIN city ON country.capital = city.ID " +
+                    "ORDER BY country.population " +
+                    "DESC LIMIT 5;";
+            ResultSet rset = stmt.executeQuery(sql);
+
+            while (rset.next()) {
+                Country country = new Country();
+                country.setCode(rset.getString("Code"));
+                country.setName(rset.getString("Name"));
+                country.setCapital(rset.getString("Capital"));
+                country.setContinent(rset.getString("Continent"));
+                country.setRegion(rset.getString("Region"));
+                country.setPopulation(rset.getInt("Population"));
+                countriesList.add(country);
+            }
+
+        } catch (SQLException e) {
+            System.out.println("Error getting all the countries in the world: " + e.getMessage());
+        }
+
+
+        return countriesList;
+    };
 }