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Java Multithreading, sample assignment

Updated: Aug 20, 2021

Question :

A robot lands on Mars, which happens to be a cartesian grid; assuming that

we hand the robot these instructions, such as LFFFRFFFRRFFF, where "L" is a

"turn 90 degrees left", "R" is a "turn 90 degrees right", and "F" is "go

forward one space, please write control code for the robot such that it

ends up at the appropriate-and-correct destination, and include unit tests.

Here is an example output with command "FF":

[0, 2]

Using the robot code/idea, create a “robot race”, of sorts:

  • This race will consist of several different robots (robots like competition)

  • Each robot will start the race at coordinate [0,0] (x,y), facing North/Up

  • Each robot will have a name. It doesn’t have to be unique, will be helpful for viewing purposes!

  • Each robot will iterate/process a series of actions: one of “L”, “R”, or “F”, just as in the previous exercise.

  • Each robot will have a delay between executing actions. Each robot can have its own delay. The delay for a robot is decided at robot creation time, and remains the same for the life of the robot.

  • Each robot will have the same starting coordinates.

  • These robots are “ghosts”, in that they can pass through one another, occupy the same space at the same time, without any issues.

  • Each robot will be given its string of actions at the beginning of the race. When you say “Go!” (start the program), each robot will simultaneously start processing through their own actions, according to the delay they have been assigned. For each action they complete, they should tell “the audience” (print to System.out) what they have done.

  • Each robot will also state the elapsed number of seconds when announcing the action most recently performed (this does not have to be perfect; hint: Thread.sleep(...) or similar would be acceptable).

  • A robot’s personal “finish line” is simply the end of its action command set. There is no need to navigate robots to a common end coordinate.

  • When a robot reaches the end of its journey, it should receive (and remember) a rank. The first to stop will get 1, the second will get 2, and so on. It also should know what coordinate it has ended on, relative to its starting point.

  • Once ALL robots have completed the race (executed all of their actions), each one will tell “the audience” (print to System.out) what its rank and final coordinate position is. Each robot will wait its turn (so the winner prints first, followed by second place, etc).

  • Once all robots have exclaimed their ranking and coordinate position, the program should terminate.

For example, if the following is true:

Joe has a delay of 3 seconds between actions, and has actions: FRFLLFRF

Bill has a delay of 1 second between actions, and has actions: FFFFFLF

Jim has a delay of 2 seconds between actions, and has actions: LFRF

This could be the program’s output:

The race has STARTED!

01s Joe: Moves F

01s Bill: Moves F

01s Jim: Turns L

02s Bill: Moves F

03s Bill: Moves F

03s Jim: Moves F

04s Joe: Turns R

04s Bill: Moves F

05s Bill: Moves F

05s Jim: Turns R

06s Bill: Turns L

07s Bill: Moves F

07s Joe: Moves F

07s Jim: Moves F

10s Joe: Turns L

13s Joe: Turns L

16s Joe: Moves F

19s Joe: Turns R

22s Joe: Moves F

22s The race has ENDED!

Bill is #1, at [-1,5]

Jim is #2, at [-1,1]

Joe is #3, at [0,2]

[Program Terminates]


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