Create test class for Java 23 ... (#23)

- Markdown Documentation Comments
- Deprecated sun.misc.Unsafe
- Update README.md

Author: mperor

README.md

@@ -34,5 +34,6 @@ This project includes unit tests for key functionalities introduced in each Java
 - [Java 20](src/test/java/pl/mperor/lab/java/Java20.java)
 - [Java 21](src/test/java/pl/mperor/lab/java/Java21.java)
 - [Java 22](src/test/java/pl/mperor/lab/java/Java22.java)
+- [Java 23](src/test/java/pl/mperor/lab/java/Java23.java)
 
 For detailed examples and tests of each feature, please refer to the individual source files linked above.

src/test/java/pl/mperor/lab/java/Java23.java

@@ -0,0 +1,54 @@
+package pl.mperor.lab.java;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import sun.misc.Unsafe;
+
+/// Java 23 (September 2024)
+/// [JDK 23](https://openjdk.org/projects/jdk/23)
+///
+/// - STANDARD FEATURES:
+///     - 467:	Markdown Documentation Comments
+///     - 471:	Deprecate the Memory-Access Methods in sun.misc.Unsafe for Removal
+///     - 474:	ZGC: Generational Mode by Default
+///
+/// - PREVIEW & INCUBATOR:
+///     - 476:	Module Import Declarations (Preview)
+///     - 455:	Primitive Types in Patterns, instanceof, and switch (Preview)
+///     - 466:	Class-File API (Second Preview)
+///     - 473:	Stream Gatherers (Second Preview)
+///     - 482:	Flexible Constructor Bodies (Second Preview)
+///     - 477:	Implicitly Declared Classes and Instance Main Methods (Third Preview)
+///     - 480:	Structured Concurrency (Third Preview)
+///     - 481:	Scoped Values (Third Preview)
+///     - 469:	Vector API (Eighth Incubator)
+public class Java23 {
+
+    /// This is a **Markdown** JavaDoc (starts with ///).
+    /// Markdown Documentation Comments are described in this [JEP](https://openjdk.org/jeps/467).
+    /// It supports *italic*, **bold**, and `code` formatting.
+    ///
+    /// As well:
+    /// - code block:
+    /// ```java
+    /// void main(){
+    ///     println("Unnamed entry point!");
+    ///}
+    ///```
+    /// - table:
+    ///
+    /// | JDK  | Year |
+    /// |------|------|
+    /// | 17   | 2021 |
+    /// | 21   | 2023 |
+    /// | 25   | 2025 |
+    @Test
+    public void testMarkdownDocumentationComments() {
+    }
+
+    @Test
+    public void testSunMiscUnsafeDeprecated() {
+        Assertions.assertThrows(SecurityException.class, Unsafe::getUnsafe);
+    }
+
+}