Update Java 18 test class ...

- samples only for standard features
- markdown javadoc for JEPs

Author: mperor

src/test/java/pl/mperor/lab/java/Java18.java

@@ -14,9 +14,21 @@
 import java.net.UnknownHostException;
 import java.nio.charset.Charset;
 
-/**
- * Java 18 (March 2022)
- */
+/// Java 18™ (March 2022)
+/// [JDK 18](https://openjdk.org/projects/jdk/18)
+///
+/// - STANDARD FEATURES:
+///     - 400:	UTF-8 by Default
+///     - 408:	Simple Web Server
+///     - 421:	Deprecate Finalization for Removal
+///     - 418:	Internet-Address Resolution SPI (service-provider interface)
+///     - 413:	Code Snippets in Java API Documentation
+///     - 416:	Reimplement Core Reflection with Method Handles
+///
+/// - PREVIEW & INCUBATOR:
+///     - 419:	Foreign Function & Memory API (Second Incubator)
+///     - 420:	Pattern Matching for switch (Second Preview)
+///     - 417:	Vector API (Third Incubator)
 public class Java18 {
 
     @Test
@@ -86,8 +98,11 @@ protected void finalize() throws Throwable {
 
     @Test
     public void testInetAddressResolution() throws UnknownHostException {
-        InetAddress address = InetAddress.getByName("localhost");
-        Assertions.assertTrue(address.isLoopbackAddress());
+        InetAddress localhost = InetAddress.getByName("localhost");
+        Assertions.assertTrue(localhost.isLoopbackAddress());
+
+        InetAddress google = InetAddress.getByName("google.com");
+        Assertions.assertNotNull(google.getAddress());
     }
 
     @Test

src/test/java/pl/mperor/lab/java/Java7.java

@@ -7,6 +7,10 @@
 import java.io.Closeable;
 import java.io.File;
 import java.io.IOException;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Method;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.concurrent.ForkJoinPool;
@@ -141,4 +145,14 @@ protected Integer compute() {
         }
     }
 
+    @Test
+    public void testMethodHandlesVsCoreReflection() throws Throwable {
+        Method method = String.class.getMethod("isEmpty");
+        Assertions.assertTrue((boolean) method.invoke(""));
+
+        MethodHandles.Lookup lookup = MethodHandles.lookup();
+        MethodHandle methodHandle = lookup.findVirtual(String.class, "isEmpty", MethodType.methodType(boolean.class));
+        Assertions.assertTrue((boolean) methodHandle.invoke(""));
+    }
+
 }