Sync Factory Method, Abstract Factory, Builder, Prototype to Java 25; fix post/code mismatches

01-creational/builder/Main.java

@@ -1,20 +1,42 @@
 package builder;
 
 public class Main {
+
     public static void main(String[] args) {
-        System.out.println("=== Builder Pattern Demo ===\n");
 
-        Director director = new Director();
+        // Simple GET — only the required field
+        HttpRequest ping = new HttpRequest.Builder()
+            .url("https://api.example.com/health")
+            .build();
 
-        House starter = director.buildStarter(new House.Builder());
-        System.out.println("Starter home : " + starter);
+        System.out.println("Simple GET: " + ping);
 
-        House luxury = director.buildLuxury(new House.Builder());
-        System.out.println("Luxury home  : " + luxury);
+        // Full POST with authentication and retry
+        HttpRequest post = new HttpRequest.Builder()
+            .url("https://api.example.com/orders")
+            .method("POST")
+            .body("{\"item\":\"book\",\"qty\":1}")
+            .header("Content-Type", "application/json")
+            .header("Authorization", "Bearer eyJ...")
+            .timeoutMs(10_000)   // 10 seconds — name is self-documenting
+            .maxRetries(3)
+            .build();
 
-        // Client builds a custom house directly without the Director
-        House custom = new House.Builder()
-                .rooms(4).floors(2).garden(true).roofType("mansard").build();
-        System.out.println("Custom home  : " + custom);
+        System.out.println("POST: " + post);
+
+        // build() throws if url is missing — validation at construction time
+        try {
+            HttpRequest bad = new HttpRequest.Builder().build(); // no URL!
+        } catch (IllegalStateException e) {
+            System.out.println("Caught: " + e.getMessage()); // url() is required
+        }
+
+        // Using the Director for the two standard presets defined above
+        HttpClientConfig config = new HttpClientConfig();
+        HttpRequest healthCheck = config.buildHealthCheck("https://api.example.com");
+        System.out.println("Health check: " + healthCheck);
+
+        HttpRequest order = config.buildResilientPost("https://api.example.com/orders", "{\"qty\":1}");
+        System.out.println("Order: " + order);
     }
 }