Suppose an object is intended to store its current position in a 2D array using private instance variables and a mutator: What problem could be encountered with the method moveLeft(), which is intended to move the current position of the object to the left one column on the grid?
A)The method should be changing the row instance variable.
B)The method should be incrementing the column instance variable.
C)The method might cause the instance variables to go out of the bounds of the 2D array.
D)The method should be changing local variables instead of instance variables.

Question

Suppose an object is intended to store its current position in a 2D array using private instance variables and a mutator:  What problem could be encountered with the method moveLeft(), which is intended to move the current position of the object to the left one column on the grid? 
A)The method should be changing the row instance variable. 
B)The method should be incrementing the column instance variable. 
C)The method might cause the instance variables to go out of the bounds of the 2D array. 
D)The method should be changing local variables instead of instance variables.

Quizplus · Accepted Answer

Moving the position to the left one column could cause the column instance variable to become negative, which would put the object's position out of bounds on the left side of the 2D array.

Suppose an Object Is Intended to Store Its Current Position