SYN: with Atomic field

Author: Yurii

src/main/java/core/basesyntax/Counter.java

@@ -1,21 +1,22 @@
 package core.basesyntax;
 
+import java.util.concurrent.atomic.AtomicInteger;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 public class Counter {
     private static final Logger logger = LogManager.getLogger(Counter.class);
     private static final String MESSAGE = "%20s, Thread # %2s, counter value %2d";
-    private int value;
+    private AtomicInteger value;
 
-    public Counter(int value) {
+    public Counter(AtomicInteger value) {
         this.value = value;
     }
 
-    public synchronized void decreaseValue() {
+    public void decreaseValue() {
         logger.info(String.format(MESSAGE,
                 "Before decrementing", Thread.currentThread().getName(), value));
-        value--;
+        value.decrementAndGet();
         logger.info(String.format(MESSAGE,
                 "After decrementing", Thread.currentThread().getName(), value));
     }

src/main/java/core/basesyntax/Main.java

@@ -1,8 +1,10 @@
 package core.basesyntax;
 
+import java.util.concurrent.atomic.AtomicInteger;
+
 public class Main {
     public static void main(String[] args) {
-        Counter counter = new Counter(20);
+        Counter counter = new Counter(new AtomicInteger(20));
         for (int i = 1; i <= 20; i++) {
             new MyThread(counter, String.valueOf(i)).start();
         }