Learning to Program with Robots (JAVA)

The link of the textbook: http://www.learningwithrobots.com/textbook/PDFs/WholeThing.pdf

Write a program implementing a robot bucket brigade. The bucket brigade consists of some number of RobotSEs positioned on consecutive intersections. There are a number of Thing objects (buckets) on the same intersection as the first robot in the brigade. When the program executes, the first robot will pick up one Thing and move it to the next robots intersection, put it down, and return to its original position. The next robot will then move the Thing one more position down the line, and so on. When the brigade is finished, all the Things will be at the other end of the line of robots, one intersection beyond the last robot.