refactor: converter pattern docs and refactoring

converter/src/main/java/com/iluwatar/converter/User.java

@@ -24,21 +24,7 @@
  */
 package com.iluwatar.converter;
 
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-import lombok.ToString;
-
 /**
- * User class.
+ * User record.
  */
-@ToString
-@EqualsAndHashCode
-@Getter
-@RequiredArgsConstructor
-public class User {
-  private final String firstName;
-  private final String lastName;
-  private final boolean active;
-  private final String userId;
-}
+public record User(String firstName, String lastName, boolean active, String userId) {}

converter/src/main/java/com/iluwatar/converter/UserConverter.java

@@ -34,11 +34,10 @@ public class UserConverter extends Converter<UserDto, User> {
   }
 
   private static UserDto convertToDto(User user) {
-    return new UserDto(user.getFirstName(), user.getLastName(), user.isActive(), user.getUserId());
+    return new UserDto(user.firstName(), user.lastName(), user.active(), user.userId());
   }
 
   private static User convertToEntity(UserDto dto) {
-    return new User(dto.getFirstName(), dto.getLastName(), dto.isActive(), dto.getEmail());
+    return new User(dto.firstName(), dto.lastName(), dto.active(), dto.email());
   }
-
 }

converter/src/main/java/com/iluwatar/converter/UserDto.java

@@ -24,23 +24,7 @@
  */
 package com.iluwatar.converter;
 
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-import lombok.ToString;
-
 /**
- * User DTO class.
+ * UserDto record.
  */
-@RequiredArgsConstructor
-@Getter
-@EqualsAndHashCode
-@ToString
-public class UserDto {
-
-  private final String firstName;
-  private final String lastName;
-  private final boolean active;
-  private final String email;
-
-}
+public record UserDto(String firstName, String lastName, boolean active, String email) {}

converter/src/test/java/com/iluwatar/converter/AppTest.java

@@ -35,7 +35,6 @@ class AppTest {
 
   /**
    * Issue: Add at least one assertion to this test case.
-   *
    * Solution: Inserted assertion to check whether the execution of the main method in {@link App#main(String[])}
    * throws an exception.
    */

converter/src/test/java/com/iluwatar/converter/ConverterTest.java

@@ -65,20 +65,20 @@ class ConverterTest {
   void testCustomConverter() {
     var converter = new Converter<UserDto, User>(
         userDto -> new User(
-            userDto.getFirstName(),
-            userDto.getLastName(),
-            userDto.isActive(),
+            userDto.firstName(),
+            userDto.lastName(),
+            userDto.active(),
             String.valueOf(new Random().nextInt())
         ),
         user -> new UserDto(
-            user.getFirstName(),
-            user.getLastName(),
-            user.isActive(),
-            user.getFirstName().toLowerCase() + user.getLastName().toLowerCase() + "@whatever.com")
+            user.firstName(),
+            user.lastName(),
+            user.active(),
+            user.firstName().toLowerCase() + user.lastName().toLowerCase() + "@whatever.com")
     );
     var u1 = new User("John", "Doe", false, "12324");
     var userDto = converter.convertFromEntity(u1);
-    assertEquals("johndoe@whatever.com", userDto.getEmail());
+    assertEquals("johndoe@whatever.com", userDto.email());
   }
 
   /**