📍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>

collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/App.java

@@ -24,8 +24,7 @@
 package com.iluwatar.collectionpipeline;
 
 import java.util.List;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * In imperative-style programming, it is common to use for and while loops for most kinds of data
@@ -35,10 +34,9 @@ import org.slf4j.LoggerFactory;
  * create sophisticated programs where data flow from upstream to downstream and is passed through a
  * series of transformations.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *

collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Car.java

@@ -23,86 +23,20 @@
 
 package com.iluwatar.collectionpipeline;
 
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
 /**
  * A Car class that has the properties of make, model, year and category.
  */
+@Getter
+@EqualsAndHashCode
+@RequiredArgsConstructor
 public class Car {
   private final String make;
   private final String model;
   private final int year;
   private final Category category;
 
-  /**
-   * Constructor to create an instance of car.
-   *
-   * @param make       the make of the car
-   * @param model      the model of the car
-   * @param yearOfMake the year of built of the car
-   * @param category   the {@link Category} of the car
-   */
-  public Car(String make, String model, int yearOfMake, Category category) {
-    this.make = make;
-    this.model = model;
-    this.year = yearOfMake;
-    this.category = category;
-  }
-
-  @Override
-  public int hashCode() {
-    final int prime = 31;
-    int result = 1;
-    result = prime * result + ((category == null) ? 0 : category.hashCode());
-    result = prime * result + ((make == null) ? 0 : make.hashCode());
-    result = prime * result + ((model == null) ? 0 : model.hashCode());
-    result = prime * result + year;
-    return result;
-  }
-
-  @Override
-  public boolean equals(Object obj) {
-    if (this == obj) {
-      return true;
-    }
-    if (obj == null) {
-      return false;
-    }
-    if (getClass() != obj.getClass()) {
-      return false;
-    }
-    Car other = (Car) obj;
-    if (category != other.category) {
-      return false;
-    }
-    if (make == null) {
-      if (other.make != null) {
-        return false;
-      }
-    } else if (!make.equals(other.make)) {
-      return false;
-    }
-    if (model == null) {
-      if (other.model != null) {
-        return false;
-      }
-    } else if (!model.equals(other.model)) {
-      return false;
-    }
-    return year == other.year;
-  }
-
-  public String getMake() {
-    return make;
-  }
-
-  public String getModel() {
-    return model;
-  }
-
-  public int getYear() {
-    return year;
-  }
-
-  public Category getCategory() {
-    return category;
-  }
 }

collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Category.java

@@ -27,5 +27,7 @@ package com.iluwatar.collectionpipeline;
  * Enum for the category of car.
  */
 public enum Category {
-  JEEP, SEDAN, CONVERTIBLE
+  JEEP,
+  SEDAN,
+  CONVERTIBLE
 }

collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Person.java

@@ -24,23 +24,16 @@
 package com.iluwatar.collectionpipeline;
 
 import java.util.List;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * A Person class that has the list of cars that the person owns and use.
  */
+@Getter
+@RequiredArgsConstructor
 public class Person {
+
   private final List<Car> cars;
 
-  /**
-   * Constructor to create an instance of person.
-   *
-   * @param cars the list of cars owned
-   */
-  public Person(List<Car> cars) {
-    this.cars = cars;
-  }
-
-  public List<Car> getCars() {
-    return cars;
-  }
 }

collection-pipeline/src/test/java/com/iluwatar/collectionpipeline/AppTest.java

@@ -27,32 +27,31 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.util.List;
 import java.util.Map;
+import lombok.extern.slf4j.Slf4j;
 import org.junit.jupiter.api.Test;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 /**
  * Tests that Collection Pipeline methods work as expected.
  */
-public class AppTest {
-  private static final Logger LOGGER = LoggerFactory.getLogger(AppTest.class);
+@Slf4j
+class AppTest {
 
   private final List<Car> cars = CarFactory.createCars();
 
   @Test
-  public void testGetModelsAfter2000UsingFor() {
+  void testGetModelsAfter2000UsingFor() {
     var models = ImperativeProgramming.getModelsAfter2000(cars);
     assertEquals(List.of("Avenger", "Wrangler", "Focus", "Cascada"), models);
   }
 
   @Test
-  public void testGetModelsAfter2000UsingPipeline() {
+  void testGetModelsAfter2000UsingPipeline() {
     var models = FunctionalProgramming.getModelsAfter2000(cars);
     assertEquals(List.of("Avenger", "Wrangler", "Focus", "Cascada"), models);
   }
 
   @Test
-  public void testGetGroupingOfCarsByCategory() {
+  void testGetGroupingOfCarsByCategory() {
     var modelsExpected = Map.of(
         Category.CONVERTIBLE, List.of(
             new Car("Buick", "Cascada", 2016, Category.CONVERTIBLE),
@@ -74,7 +73,7 @@ public class AppTest {
   }
 
   @Test
-  public void testGetSedanCarsOwnedSortedByDate() {
+  void testGetSedanCarsOwnedSortedByDate() {
     var john = new Person(cars);
     var modelsExpected = List.of(
         new Car("Dodge", "Avenger", 2010, Category.SEDAN),