Update README.md

Author: RuedigerLunde

aima-core/README.md

@@ -77,18 +77,15 @@ To actually search you need to:
 
 A good example (from the NQueens Demo) is:
 ```java
-private static void nQueensWithBreadthFirstSearch() {
-    try {
-	System.out.println("\nNQueensDemo BFS -->");
- 	Problem<NQueensBoard, QueenAction> problem =
-		NQueensFunctions.createIncrementalFormulationProblem(boardSize);
-	SearchForActions<NQueensBoard, QueenAction> search = new BreadthFirstSearch<>(new TreeSearch<>());
-	SearchAgent<Object, NQueensBoard, QueenAction> agent = new SearchAgent<>(problem, search);
-	printActions(agent.getActions());
-	printInstrumentation(agent.getInstrumentation());
-    } catch (Exception e) {
-	e.printStackTrace();
-    }
+private static void solveNQueensWithBreadthFirstSearch() {
+    System.out.println("\n--- NQueensDemo BFS ---");
+
+    Problem<NQueensBoard, QueenAction> problem = NQueensFunctions.createIncrementalFormulationProblem(boardSize);
+    SearchForActions<NQueensBoard, QueenAction> search = new BreadthFirstSearch<>(new GraphSearch<>());
+    Optional<List<QueenAction>> actions = search.findActions(problem);
+
+    actions.ifPresent(qActions -> qActions.forEach(System.out::println));
+    System.out.println(search.getMetrics());
 }
 ```
 For further information about code design, see [Wiki2](https://github.com/aimacode/aima-java/wiki/AIMA3e-Search-Framework).