Updates from PR comments

core-java-modules/core-java-15/pom.xml

@@ -51,8 +51,8 @@
                 <configuration>
                     <release>${maven.compiler.release}</release>
                     <compilerArgs>--enable-preview</compilerArgs>
-                    <source>14</source>
-                    <target>14</target>
+                    <source>15</source>
+                    <target>15</target>
                 </configuration>
             </plugin>
             <plugin>

core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/records/Person.java

@@ -3,13 +3,15 @@ package com.baeldung.whatsnew.records;
 /**
  * Java record with a header indicating 2 fields.
  */
-public record Person(String name, int age) {
-
+public record Person(String name, int age)
+{
     /**
      * Public constructor that does some basic validation.
      */
-    public Person {
-        if (age < 0) {
+    public Person
+    {
+        if (age < 0)
+        {
             throw new IllegalArgumentException("Age cannot be negative");
         }
     }

core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Employee.java

@@ -2,12 +2,10 @@ package com.baeldung.whatsnew.sealedclasses;
 
 import java.util.Date;
 
-public non-sealed class Employee extends Person {
-
+public non-sealed class Employee extends Person
+{
     public Date getHiredDate()
     {
         return new Date();
     }
-
-
 }

core-java-modules/core-java-15/src/main/java/com/baeldung/whatsnew/sealedclasses/Manager.java

@@ -1,4 +1,5 @@
 package com.baeldung.whatsnew.sealedclasses;
 
-public final class Manager extends Person {
+public final class Manager extends Person
+{
 }