Decrease counter

README.md

@@ -10,7 +10,7 @@ We are logging the value before and after each decrement, and now we see that th
 
 ```
 INFO core.basesyntax.Counter:16  Before decrementing, Thread # 15, counter value 20
-INFO core.basesyntax.Counter:16  Before decrementing, Thread #  8, counter value 20
+INFO core.basesyntax.Counter[src](src):16  Before decrementing, Thread #  8, counter value 20
 INFO core.basesyntax.Counter:16  Before decrementing, Thread # 12, counter value 20
 INFO core.basesyntax.Counter:16  Before decrementing, Thread # 18, counter value 20
 INFO core.basesyntax.Counter:16  Before decrementing, Thread # 14, counter value 20

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

@@ -1,22 +1,23 @@
 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) {
-        this.value = value;
+        this.value = new AtomicInteger(value);
     }
 
     public void decreaseValue() {
         logger.info(String.format(MESSAGE,
-                "Before decrementing", Thread.currentThread().getName(), value));
-        value--;
+                "Before decrementing", Thread.currentThread().getName(), value.get()));
+        value.incrementAndGet();
         logger.info(String.format(MESSAGE,
-                "After decrementing", Thread.currentThread().getName(), value));
+                "After decrementing", Thread.currentThread().getName(), value.get()));
     }
 }