Add all 23 GoF design pattern implementations (2026-06-13)

02-structural/facade/Main.java

@@ -0,0 +1,30 @@
+package facade;
+
+/**
+ * Facade Design Pattern — Runnable Demo
+ *
+ * Demonstrates reducing a complex video conversion subsystem
+ * to a single method call via a Facade.
+ *
+ * Run: javac facade/*.java && java facade.Main
+ * Article: https://ankurm.com/facade-design-pattern-java/
+ */
+public class Main {
+
+    public static void main(String[] args) {
+        System.out.println("=== Facade Design Pattern Demo ===\n");
+
+        VideoConversionFacade converter = new VideoConversionFacade();
+
+        System.out.println("-- Client: just one method call --");
+        String result1 = converter.convertVideo("holiday.ogg", "mp4");
+        System.out.println("Output: " + result1);
+
+        System.out.println();
+        String result2 = converter.convertVideo("presentation.mp4", "ogg");
+        System.out.println("Output: " + result2);
+
+        System.out.println("\nClient code: 1 line. Subsystem: 6 classes. Facade hides the complexity.");
+        System.out.println("\n=== Demo complete ===");
+    }
+}