pac means presentation abstraction control ..

OBJECTIVES To expose students to user interface programming through the use of software design patterns for interface design A secondary goal of the assignment is to gain some familiarity with the Presentation Abstraction and Control (PAC) software design pattem. PROBLEM You are to use the PAC Software design pattern to create a user interface for a 9 page book. The interface must have four buttons to allow the user to render the first page, last, previous, and the next page of the book. The rendering behavior has access to an array of book pages and must render the first page of the book, Page1, when your solution starts executing. The table that follows lists the behavior associated with each one of the four buttons. Behavior of Buttons First Previous Next Renders first page Renders previous page Renders next page Renders last page Unavailable if previous Unavailable if current Unavailable if current Unavailable if previous action reached the first page is the first pape is the last action reached the last Last An abstraction of the 9 page book is provided by the structure below where the upper row refers to page numbers and the bottom row indicates the contents of each page. For instance, the left most cell of this two dimensional structure refers to page number 1 (first) which contains the string Page 1" and the right most cell refers to page number 9 (last) which contains the string Pages 2 5 6 7 8 Page 1 Pape2 Page 3 3 Page 4 Pages Pape Page 7 Page 8 Page 9 9 4 3 1