Improved toString

todolist/core/src/main/java/todolist/core/TodoList.java

@@ -21,7 +21,7 @@ public class TodoList implements Iterable<TodoItem> {
 
   @Override
   public String toString() {
-    return String.format("[TodoList name=%s deadline=%s]", getName(), getDeadline());
+    return String.format("[TodoList name=%s deadline=%s #item=%s]", getName(), getDeadline(), items.size());
   }
 
   public String getName() {

todolist/core/src/main/java/todolist/core/TodoModel.java

@@ -8,6 +8,11 @@ public class TodoModel implements Iterable<TodoList> {
 
   private Collection<TodoList> todoLists = new ArrayList<>();
 
+  @Override
+  public String toString() {
+    return String.format("[TodoModel #todoLists=%s]", todoLists.size());
+  }
+
   public void addTodoList(TodoList list) {
     todoLists.add(list);
   }