Object-oriented Software in Ada 95

130 Case study: Design of a game
Cell Add Add a counter to a cell.
Display
Display the contents of a cell.
Flip
Flip the contents of a cell.
Holds
Return the contents of a cell.
Initialize
Initialize a cell.
Class Message Responsibility of method
Counter Display
Flip
Rep
Set
Display a counter.
Flip a counter.
Return the colour of a counter.
Set a counter to be black/white.
Game Play Play the game.
Note:
9.3 Class diagram
Some of the original messages (verbs) have been renamed to a more specific name when producing this
list.
A class diagram for the game of draughts is shown below in Figure 9.4
Player Counter Cell
1 1 1 1
2 64
1
Game
1
1
Board
1
Figure 9.4 Relationship between the classes in the game of four counters.
9.4 Specification of the Ada classes
The Ada class specifications for the above classes are implemented as follows:
Class
Game
Ada specification
package Class_Game is
type Game is private;
procedure Play( The:in Game );
private
end Class_Counter;
© M A Smith - May not be reproduced without permission