📍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>

private-class-data/README.md

@@ -37,8 +37,8 @@ Taking our stew example from above. First we have a `Stew` class where its data
 private class data, making the stew's ingredient mutable to class methods. 
 
 ```java
+@Slf4j
 public class Stew {
-  private static final Logger LOGGER = LoggerFactory.getLogger(Stew.class);
   private int numPotatoes;
   private int numCarrots;
   private int numMeat;
@@ -99,8 +99,8 @@ public class StewData {
     return numPeppers;
   }
 }
+@Slf4j
 public class ImmutableStew {
-  private static final Logger LOGGER = LoggerFactory.getLogger(ImmutableStew.class);
   private final StewData data;
   public ImmutableStew(int numPotatoes, int numCarrots, int numMeat, int numPeppers) {
     data = new StewData(numPotatoes, numCarrots, numMeat, numPeppers);

private-class-data/src/main/java/com/iluwatar/privateclassdata/ImmutableStew.java

@@ -23,16 +23,14 @@
 
 package com.iluwatar.privateclassdata;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Immutable stew class, protected with Private Class Data pattern.
  */
+@Slf4j
 public class ImmutableStew {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(ImmutableStew.class);
-
   private final StewData data;
 
   public ImmutableStew(int numPotatoes, int numCarrots, int numMeat, int numPeppers) {

private-class-data/src/main/java/com/iluwatar/privateclassdata/Stew.java

@@ -23,16 +23,14 @@
 
 package com.iluwatar.privateclassdata;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Mutable stew class.
  */
+@Slf4j
 public class Stew {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Stew.class);
-
   private int numPotatoes;
   private int numCarrots;
   private int numMeat;

private-class-data/src/test/java/com/iluwatar/privateclassdata/ImmutableStewTest.java

@@ -53,7 +53,7 @@ public class ImmutableStewTest {
    * Verify if mixing the stew doesn't change the internal state
    */
   @Test
-  public void testMix() {
+  void testMix() {
     var stew = new Stew(1, 2, 3, 4);
     var expectedMessage = "Mixing the stew we find: 1 potatoes, 2 carrots, 3 meat and 4 peppers";
 
@@ -69,7 +69,7 @@ public class ImmutableStewTest {
    * Verify if tasting the stew actually removes one of each ingredient
    */
   @Test
-  public void testDrink() {
+  void testDrink() {
     final var stew = new Stew(1, 2, 3, 4);
     stew.mix();
 

private-class-data/src/test/java/com/iluwatar/privateclassdata/StewTest.java

@@ -53,7 +53,7 @@ public class StewTest {
    * Verify if mixing the stew doesn't change the internal state
    */
   @Test
-  public void testMix() {
+  void testMix() {
     final var stew = new ImmutableStew(1, 2, 3, 4);
     final var expectedMessage = "Mixing the immutable stew we find: 1 potatoes, "
         + "2 carrots, 3 meat and 4 peppers";