enhancement: Refactor and add explanation for value object (#1942)

Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>

value-object/src/main/java/com/iluwatar/value/object/HeroStat.java

@@ -23,10 +23,7 @@
 
 package com.iluwatar.value.object;
 
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-import lombok.ToString;
+import lombok.Value;
 
 /**
  * HeroStat is a value object.
@@ -35,23 +32,10 @@ import lombok.ToString;
  *     http://docs.oracle.com/javase/8/docs/api/java/lang/doc-files/ValueBased.html
  *     </a>
  */
-@Getter
-@ToString
-@EqualsAndHashCode
-@RequiredArgsConstructor
-public class HeroStat {
-
-  // Stats for a hero
-
-  private final int strength;
-  private final int intelligence;
-  private final int luck;
-
-  // Static factory method to create new instances.
-  public static HeroStat valueOf(int strength, int intelligence, int luck) {
-    return new HeroStat(strength, intelligence, luck);
-  }
-
-  // The clone() method should not be public. Just don't override it.
+@Value(staticConstructor = "valueOf")
+class HeroStat {
 
+  int strength;
+  int intelligence;
+  int luck;
 }