Fixed missing "class" keyword on line 3541

Spartan09 · web-flow · commit 621d4f28f802 · 2021-12-29T06:56:53.000+05:30
diff --git a/data/part-5/4-objects-and-references.md b/data/part-5/4-objects-and-references.md
@@ -3538,7 +3538,7 @@ public Laskuri {
 ``` -->
 
 ```java
-public Counter {
+public class Counter {
     private int value;
 
     // example of using multiple constructors:
