https://dplabs.tech/tags/java-17/ Recent content in Java-17 on dplabs — Software Engineering & Technology Consultancy Hugo en-us Mon, 27 Jan 2025 00:00:00 +0000 https://dplabs.tech/blog/records-sealed-classes-domain-models/ Mon, 27 Jan 2025 00:00:00 +0000 https://dplabs.tech/blog/records-sealed-classes-domain-models/ <p>Java domain modeling has historically been verbose and error-prone. Entity classes with dozens of getter/setter pairs, boolean fields that encode state (<code>isActive</code>, <code>isCancelled</code>, <code>isPending</code>), and null fields used to represent the absence of a value all create code that&rsquo;s hard to understand and easy to misuse.</p> <p>Records and sealed classes address this. They&rsquo;re not cosmetic improvements — they change what kinds of mistakes the compiler can catch for you.</p> <h2 id="records-immutable-data-carriers">Records: Immutable Data Carriers</h2> <p>A record is a class defined by its components. The compiler generates the constructor, accessors, <code>equals</code>, <code>hashCode</code>, and <code>toString</code> automatically:</p>