The class must have these private instance variables:

private int$[]$ start, end

The class must have the following public methods:

public Line$($int row, int col, boolean horizontal, int length$)[$this is the constructor$]$

Constructs a line starting at row, col that is horizontal if parameter horizontal is

true or vertical if the parameter is false; the length of the line is specified by the

last parameter $($an int greater than $0).$ Notes: The parameters of this method

specify the row and column of the beginning of the line, but you must compute

the row and column of the end of the line. start$[0]$ should be set to the row of the

beginning of the line and start$[1]$ should be set to its column; end$[0]$ should be set

to the row of the end of the line and end$[1]$ should be set to its column.