docs: update abstract factory

abstract-factory/src/main/java/com/iluwatar/abstractfactory/App.java

@@ -24,6 +24,7 @@
  */
 package com.iluwatar.abstractfactory;
 
+import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 
 /**
@@ -41,14 +42,11 @@ import lombok.extern.slf4j.Slf4j;
  * both concrete implementations to create a king, a castle, and an army.
  */
 @Slf4j
+@Getter
 public class App implements Runnable {
 
   private final Kingdom kingdom = new Kingdom();
 
-  public Kingdom getKingdom() {
-    return kingdom;
-  }
-
   /**
    * Program entry point.
    *

abstract-factory/src/main/java/com/iluwatar/abstractfactory/Kingdom.java

@@ -57,7 +57,6 @@ public class Kingdom {
       return switch (type) {
         case ELF -> new ElfKingdomFactory();
         case ORC -> new OrcKingdomFactory();
-        default -> throw new IllegalArgumentException("KingdomType not supported.");
       };
     }
   }