📍Use lombok, reformat, and optimize the code (#1560)

* Use lombok, reformat, and optimize the code

* Fix merge conflicts and some sonar issues

Co-authored-by: va1m <va1m@email.com>

dao/src/main/java/com/iluwatar/dao/App.java

@@ -26,9 +26,8 @@ package com.iluwatar.dao;
 import java.sql.SQLException;
 import java.util.List;
 import javax.sql.DataSource;
+import lombok.extern.slf4j.Slf4j;
 import org.h2.jdbcx.JdbcDataSource;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Data Access Object (DAO) is an object that provides an abstract interface to some type of
@@ -42,9 +41,9 @@ import org.slf4j.LoggerFactory;
  * without directly interacting with the data source. The below example demonstrates basic CRUD
  * operations: select, add, update, and delete.
  */
+@Slf4j
 public class App {
   private static final String DB_URL = "jdbc:h2:~/dao";
-  private static final Logger log = LoggerFactory.getLogger(App.class);
   private static final String ALL_CUSTOMERS = "customerDao.getAllCustomers(): ";
 
   /**
@@ -86,23 +85,23 @@ public class App {
 
   private static void performOperationsUsing(final CustomerDao customerDao) throws Exception {
     addCustomers(customerDao);
-    log.info(ALL_CUSTOMERS);
+    LOGGER.info(ALL_CUSTOMERS);
     try (var customerStream = customerDao.getAll()) {
-      customerStream.forEach((customer) -> log.info(customer.toString()));
+      customerStream.forEach(customer -> LOGGER.info(customer.toString()));
     }
-    log.info("customerDao.getCustomerById(2): " + customerDao.getById(2));
+    LOGGER.info("customerDao.getCustomerById(2): " + customerDao.getById(2));
     final var customer = new Customer(4, "Dan", "Danson");
     customerDao.add(customer);
-    log.info(ALL_CUSTOMERS + customerDao.getAll());
+    LOGGER.info(ALL_CUSTOMERS + customerDao.getAll());
     customer.setFirstName("Daniel");
     customer.setLastName("Danielson");
     customerDao.update(customer);
-    log.info(ALL_CUSTOMERS);
+    LOGGER.info(ALL_CUSTOMERS);
     try (var customerStream = customerDao.getAll()) {
-      customerStream.forEach((cust) -> log.info(cust.toString()));
+      customerStream.forEach(cust -> LOGGER.info(cust.toString()));
     }
     customerDao.delete(customer);
-    log.info(ALL_CUSTOMERS + customerDao.getAll());
+    LOGGER.info(ALL_CUSTOMERS + customerDao.getAll());
   }
 
   private static void addCustomers(CustomerDao customerDao) throws Exception {

dao/src/main/java/com/iluwatar/dao/Customer.java

@@ -23,70 +23,25 @@
 
 package com.iluwatar.dao;
 
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
 /**
  * A customer POJO that represents the data that will be read from the data source.
  */
+@Setter
+@Getter
+@ToString
+@EqualsAndHashCode(onlyExplicitlyIncluded = true)
+@AllArgsConstructor
 public class Customer {
 
+  @EqualsAndHashCode.Include
   private int id;
   private String firstName;
   private String lastName;
 
-  /**
-   * Creates an instance of customer.
-   */
-  public Customer(int id, String firstName, String lastName) {
-    this.id = id;
-    this.firstName = firstName;
-    this.lastName = lastName;
-  }
-
-  public int getId() {
-    return id;
-  }
-
-  public void setId(final int id) {
-    this.id = id;
-  }
-
-  public String getFirstName() {
-    return firstName;
-  }
-
-  public void setFirstName(final String firstName) {
-    this.firstName = firstName;
-  }
-
-  public String getLastName() {
-    return lastName;
-  }
-
-  public void setLastName(final String lastName) {
-    this.lastName = lastName;
-  }
-
-  @Override
-  public String toString() {
-    return "Customer{" + "id=" + getId() + ", firstName='" + getFirstName() + '\'' + ", lastName='"
-        + getLastName() + '\'' + '}';
-  }
-
-  @Override
-  public boolean equals(final Object that) {
-    var isEqual = false;
-    if (this == that) {
-      isEqual = true;
-    } else if (that != null && getClass() == that.getClass()) {
-      final var customer = (Customer) that;
-      if (getId() == customer.getId()) {
-        isEqual = true;
-      }
-    }
-    return isEqual;
-  }
-
-  @Override
-  public int hashCode() {
-    return getId();
-  }
 }

dao/src/main/java/com/iluwatar/dao/DbCustomerDao.java

@@ -34,28 +34,18 @@ import java.util.function.Consumer;
 import java.util.stream.Stream;
 import java.util.stream.StreamSupport;
 import javax.sql.DataSource;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * An implementation of {@link CustomerDao} that persists customers in RDBMS.
  */
+@Slf4j
+@RequiredArgsConstructor
 public class DbCustomerDao implements CustomerDao {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(DbCustomerDao.class);
-
   private final DataSource dataSource;
 
-  /**
-   * Creates an instance of {@link DbCustomerDao} which uses provided <code>dataSource</code> to
-   * store and retrieve customer information.
-   *
-   * @param dataSource a non-null dataSource.
-   */
-  public DbCustomerDao(DataSource dataSource) {
-    this.dataSource = dataSource;
-  }
-
   /**
    * Get all customers as Java Stream.
    *