diff --git a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
index ff9d9f5..f0a995d 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
@@ -1,13 +1,14 @@
 package org.ntlab.citrusserver.repositories;
 
 import org.ntlab.citrusserver.entities.Account;
+import org.ntlab.citrusserver.entities.Book;
 import org.springframework.stereotype.Repository;
 import java.util.HashMap;
 
 @Repository
 public class BookManager {
 
-    private HashMap<String, HashMap<Integer, Book>> booksMap = new HashMap<String, HashMap<Integer, Book>>();
+    private HashMap<String, HashMap<Integer, Book>> booksMap = new HashMap<>();
 
     //本の一覧を返す
     public HashMap<String, HashMap<Integer, Book>> getBooksMap()
@@ -48,7 +49,7 @@
     }
 
     //本のタイトルを変更
-    public void putColor(String accountId, Integer bookId, String title)
+    public void putTitle(String accountId, Integer bookId, String title)
     {
         booksMap.get(accountId).get(bookId).setTitle(title);
     }