19. 고객,도서관리

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2. BookCustomer.java

  (1)                                 (2)                                       (3)                                      (4)

   (5)                                (6)                                          (7)

 

실행결과

3. BookBook.java

(1)                                    (2)                                 (3)                      (4)                                

(5)                                  (6)                                  (7)                                      (8)

실행결과