(Case Study) GridWorld’s firstProject file contains the BugRunner driver:public class BugR...

(Case Study) GridWorld’s

firstProject

file contains the

BugRunner

driver:

public class BugRunner{   public static void main(String[] args)   {      ActorWorld world = new ActorWorld() ;      world.add(new Bug());      world.add(new Rock());      world.show() ;   } // end main} // end class BugRunner

BugRunner

starts by creating an instance of

ActorWorld

called

world. ActorWorld’s

constructor immediately creates a 10 by 10

BoundedGrid.

Next,

BugRunner

asks the

ActorWorld

object to add a new

Bug

at a random location, and then add a new

Rock

at a different random location.

ActorWorld’s add

method tells each new occupant where it is supposed to go in the grid, and then tells that occupant to put itself into the grid at that location.

BugRunner’s

last statement calls

ActorWorld’s

show method. This

show

method instantiates a

WorldFrame

(a GUI window) with an argument referring back to the

ActorWorld

object.

WorldFrame’s

constructor instantiates a

GridPanel.

Then it uses its reference to the

ActorWorld

object to get a reference to the

BoundedGrid,

and it passes this

BoundedGrid

reference on to the new

GridPanel.

GridPanel’s drawOccupants

method uses this

BoundedGrid

reference to call

BoundedGrid’s getOccupiedLocations

method. This allows

GridPanel’s paintComponent

method to put bug and rock images in their proper places each time it repaints the screen.

Draw an abbreviated UML class diagram that contains all classes identified in the above two paragraphs, except for the

BugRunner

class. Use appropriate composition (black diamond) and aggregation (hollow diamond) links. Include multiplicity symbols where one of the multiplicities might be greater than unity. For the relationship between

ActorWorld

and

WorldFrame,

use simple bidirectional association, like this:

Or use bidirectional dependence, like this: