fix

pp.A4-HandOverHandLocking/src/main/java/pp/ThreadsafeSimplifiedList.java

@@ -52,9 +52,8 @@ public class ThreadsafeSimplifiedList<T> implements SimplifiedList<T> {
 			}
 		}
 		try {
-			return (ptr.element);
-		}
-		finally {
+			return delay(ptr.element);
+		} finally {
 			ptr.lock.unlock();
 		}
 	}
@@ -113,10 +112,13 @@ public class ThreadsafeSimplifiedList<T> implements SimplifiedList<T> {
 				throw new IndexOutOfBoundsException(index + " out of bounds");
 			}
 		}
+		try {
 			var prevElement = ptr.element;
 			ptr.element = element;
-		ptr.lock.unlock();
 			return prevElement;
+		} finally {
+			ptr.lock.unlock();
+		}
 	}
 
 	/**