added basic services

src/Main.java

@@ -1,5 +1,23 @@
+import services.AppConfigService;
+import services.DatabaseService;
+
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        final App app = new App();
+        app.run();
+    }
+}
+
+class App {
+    public App() {
+        databaseService = new DatabaseService();
+        appConfigService = new AppConfigService();
+    }
+
+    final DatabaseService databaseService;
+    final AppConfigService appConfigService;
+
+    public void run() {
+        appConfigService.promptUserArguments();
     }
 }

src/constants/ConstFormatters.java

@@ -0,0 +1,7 @@
+package constants;
+
+import java.text.SimpleDateFormat;
+
+public class ConstFormatters{
+    final public static SimpleDateFormat APPLICATION_DATE_FORMATTER = new SimpleDateFormat("dd-MM-yyyy");
+}

src/constants/ConstValues.java

@@ -0,0 +1,7 @@
+package constants;
+
+public class ConstValues {
+    //I
+    final public static String inputCountryName = "Enter country: ";
+    final public static String inputDate = "Enter date: ";
+}

src/services/AppConfigService.java

@@ -0,0 +1,44 @@
+package services;
+
+import constants.ConstFormatters;
+import constants.ConstValues;
+
+import java.text.ParseException;
+
+import java.util.Date;
+import java.util.Scanner;
+
+/**
+ * Prompts and stores the configuration that the app needs to be run with.
+ */
+public class AppConfigService {
+    String countryName;
+    Date date;
+
+    public void promptUserArguments() {
+        final Scanner scanner = new Scanner(System.in);
+        System.out.println(ConstValues.inputCountryName);
+        countryName = scanner.nextLine();
+        System.out.println();
+
+        System.out.println(ConstValues.inputDate);
+        while (true) {
+            try {
+                date = ConstFormatters.APPLICATION_DATE_FORMATTER.parse(scanner.nextLine());
+                // Always using exact current date. Otherwise, different day possible at the start of the run.
+                if (date.after(new Date())) {
+                    System.out.println("There is no data available for the future yet... Try again:");
+                    continue;
+                }
+
+                // Not doing anymore month/day validations.
+
+                break;
+            } catch (ParseException e) {
+                System.out.printf("Unable to parse date. Should be in format '%s'.\nTry again:%n", ConstFormatters.APPLICATION_DATE_FORMATTER.toPattern());
+            }
+        }
+        
+        scanner.close();
+    }
+}

src/services/DatabaseService.java

@@ -0,0 +1,37 @@
+package services;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+/**
+ * Stores the active connection between the app and the local SQL Server.
+ */
+public class DatabaseService {
+    private final String url = "jdbc:postgresql://localhost:5432/lunatech_covid";
+    private final String user = "postgres";
+    private final String password = "postgres";
+
+    private final Connection connection;
+
+    public DatabaseService() {
+        connection = connect();
+    }
+
+    /**
+     * Connect to the PostgreSQL database
+     *
+     * @return a Connection object
+     */
+    private Connection connect() {
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection(url, user, password);
+            System.out.println("Connected to the PostgreSQL server successfully.");
+        } catch (SQLException e) {
+            System.out.println(e.getMessage());
+        }
+
+        return  connection;
+    }
+}