Add java11-features module: runnable demos and captured output for the ankurm.com java11-features article

java11-features/src/NestMates.java

@@ -0,0 +1,13 @@
+import java.lang.reflect.Modifier;
+
+/** JEP 181: nest-based access. Private members of nest mates no longer need synthetic accessor methods. */
+public class NestMates {
+    private int secret = 42;
+    static class Inner { int peek(NestMates n) { return n.secret; } }
+    public static void main(String[] args) {
+        System.out.println("nest host       : " + Inner.class.getNestHost().getSimpleName());
+        System.out.println("inner can read  : " + new Inner().peek(new NestMates()));
+        long synthetic = java.util.Arrays.stream(NestMates.class.getDeclaredMethods()).filter(m -> m.getName().startsWith("access$")).count();
+        System.out.println("access$ methods on outer: " + synthetic);
+    }
+}