Ch 6 GridWorld

Question 1

locatin of location class

Answer 1

info.gridworld.grid.Location

Question 2

location of Grid interface

Answer 2

info.gridworld.grid.Grid

Question 3

location of Actor class

Answer 3

info.gridworld.actor.Actor

all the bug, folwer, rock, critter, sub critters and sub bug are located here as well (info.gridworld.actor) and extend Actor

Question 4

the runner classes ( e.g. BoxBugRunner)

Answer 4

are not tested on the AP exam

Question 5

You need to know the documentation (API) for

Answer 5

the Grid interface, Location class, and Actor, Flower, and Rock classes.

Question 6

You need to know the implementations (code) for

Answer 6

Bug, BoxBug, Critter, Chameleon Critter

Question 7

a runner class

Answer 7

configures the grid and supplies a main method for a particular object

Question 8

Location objects are

Answer 8

immutable; once created they can not change.+

Question 9

grid’s put and remove methods should

Answer 9

never be used directly - use Actor’s putSelfInGrid and removeSelfFromGrid instead.

otherwise the actor won’t know that it was put in he grid, or the actor will “htink” it is sitlll in the grid while it no longer is.

Question 10

a critter

Answer 10

is an actor that can interact with other actors in a more sophisticated way.

Question 11

Critter’s act method

Answer 11

1 get a list of actors to interact with
2 process actors form that list
3 get a list of locations that are candidates for this critter’s next move
4 select a location to move to from the list obtained in step 3
5 move to the selected location

Question 12

ap exam questions may ask you to reason about or to write a subclass of

Answer 12

critter

Question 13

a critter is an actor that ____ processes some other actors,____ moves

Answer 13

first, then

Question 14

for critter, getactors, getmovelocations, and selectmovelocation must

Answer 14

leave the state of all actors unchanged

Question 15

for critter, processactors can

Answer 15

only change hte staet of this critter and the actors in hte given list, and itm ust leave the location of this critter unchange

Question 16

makeMove

Answer 16

can change only hte state of this critter and the actor in hte new location (if any)

Question 17

selectMoveLocation

Answer 17

can return only a location from a given list, a null, or this critter’s current location