📍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>

producer-consumer/src/main/java/com/iluwatar/producer/consumer/App.java

@@ -23,11 +23,9 @@
 
 package com.iluwatar.producer.consumer;
 
-import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Producer Consumer Design pattern is a classic concurrency or threading pattern which reduces
@@ -39,10 +37,9 @@ import org.slf4j.LoggerFactory;
  * different timing require to produce item or consuming item. by using producer consumer pattern
  * both Producer and Consumer Thread can work with different speed.
  */
+@Slf4j
 public class App {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
-
   /**
    * Program entry point.
    *

producer-consumer/src/main/java/com/iluwatar/producer/consumer/Consumer.java

@@ -23,16 +23,14 @@
 
 package com.iluwatar.producer.consumer;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * Class responsible for consume the {@link Item} produced by {@link Producer}.
  */
+@Slf4j
 public class Consumer {
 
-  private static final Logger LOGGER = LoggerFactory.getLogger(Consumer.class);
-
   private final ItemQueue queue;
 
   private final String name;

producer-consumer/src/test/java/com/iluwatar/producer/consumer/ConsumerTest.java

@@ -40,7 +40,7 @@ public class ConsumerTest {
   private static final int ITEM_COUNT = 5;
 
   @Test
-  public void testConsume() throws Exception {
+  void testConsume() throws Exception {
     final var queue = spy(new ItemQueue());
     for (var id = 0; id < ITEM_COUNT; id++) {
       queue.put(new Item("producer", id));

producer-consumer/src/test/java/com/iluwatar/producer/consumer/ProducerTest.java

@@ -40,7 +40,7 @@ import org.junit.jupiter.api.Test;
 public class ProducerTest {
 
   @Test
-  public void testProduce() {
+  void testProduce() {
     assertTimeout(ofMillis(6000), () -> {
       final var queue = mock(ItemQueue.class);
       final var producer = new Producer("producer", queue);