無法將對象和列表一起添加到對象列表

Question

我有一個類，我試圖將一個Bookstore類和一個Books列表對象添加到對象列表中。但是，在添加書籍列表時出現類型轉換錯誤。

這裏是我的REST客戶端：

public class Test { 

public static void main(String[] args) { 

    ClientConfig config = new DefaultClientConfig(); 
    Client client = Client.create(config); 
    WebResource service = client.resource(getBaseURI()); 

    ResponseList responseList = service.path("rest").path("BookMain/get").accept(MediaType.APPLICATION_XML).get(ResponseList.class); 
    BookStore bs = (BookStore) responseList.getList().get(0); 
    ArrayList<Book> lb = (ArrayList<Book>) responseList.getList().get(1); 
} 

這裏是我的類，它是增加的書籍書店對象和列表：

@GET 
@Path("/get") 
@Produces(MediaType.APPLICATION_XML) 
public ResponseList addObjects() { 

    BookStore bookstore = new BookStore(); 
    bookstore.setName("Prateek Bookstore"); 
    bookstore.setLocation("Vasanth Nagar"); 

    Book book1 = new Book(); 
    book1.setName("Book2"); 
    book1.setAuthor("Author2"); 

    Book book2 = new Book(); 
    book2.setName("Book3"); 
    book2.setAuthor("Author3"); 

    ArrayList<Book> Blist = new ArrayList<Book>(); 
    Blist.add(book1); 
    Blist.add(book2); 

    ArrayList<Object> list = new ArrayList<Object>(); 
    list.add(bookstore); 
    list.addAll(Blist); 

    ResponseList books = new ResponseList(); 
    books.setList(list); 

    return books; 
} 

這是錯誤：

Exception in thread "main" java.lang.ClassCastException:Book cannot be cast to java.util.ArrayList 

這是我的ResponseList：

@XmlRootElement 
@XmlSeeAlso({BookStore.class,Book.class,Hello.class}) 
public class ResponseList { 

    private List<Object> list; 

    public List<Object> getList() { 
     return list; 
    } 
    public void setList(List<Object> list) { 
     this.list = list; 
    } 
} 

這是圖書城等級：

@XmlRootElement 
@XmlType(propOrder = {"name", "location"}) 
public class BookStore { 

    private String name; 
    private String location; 

    public String getName() { 
     return name; 
    } 
    public String getLocation() { 
     return location; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public void setLocation(String location) { 
     this.location = location; 
    } 
} 

這是Book類：

@XmlRootElement 
public class Book { 

    private String name; 
    private String author; 

    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public String getAuthor() { 
     return author; 
    } 
    public void setAuthor(String author) { 
     this.author = author; 
    } 
} 

雲誰能告訴我什麼，我做錯了什麼？