commented patterns

src/main/java/uk/ac/cam/acr31/oop/democode1920/lecture11/Readers.java

@@ -4,6 +4,7 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
+import java.io.FileReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -20,9 +21,11 @@ public class Readers {
 
     // Demonstrate decorator and adaptor pattern
     try (BufferedReader is =
-        new BufferedReader(
-            new InputStreamReader(
-                new GZIPInputStream(new FileInputStream(book)), StandardCharsets.UTF_8))) {
+        new BufferedReader(  // decorator
+            new InputStreamReader( // adapter
+                new GZIPInputStream( // decorator
+                        new FileInputStream(book) // concrete implementation
+                ), StandardCharsets.UTF_8))) {
       String line;
       while ((line = is.readLine()) != null) {
         System.out.println(line);