Assignment 2 Solution

The goal of this assignment is to write a Java program consisting of multiple methods as well as the use of the secure random number generator. This assignment accounts for 10% of your final grade. Only submit your Java source file(s), and do not submit class or IDE-related files.




Note: please do your own work, sharing and/or copying code and/or solution ideas with/from others will result in a grade of 0 and disciplinary actions for all involved parties. If you run into any problems and have done your best to solve them, please see me before/after class or e-mail me.




Problem Description:




Remember to properly comment your code. Comments should precede variables, method declarations, and major steps in your code.




Write a program which simulates a race between two contenders. Use the Java secure random number generator class to simulate the movements of the two racers. The race will continue until there is a winner (or a tie). The race track consists of 100 squares and the first racer to reach or pass the final square (i.e. 100) wins the race. The course weaves its way up the side of a slippery mountain, so occasionally the contenders lose ground. A clock ticks once per second (i.e. iteration). With each tick of the clock, your program should adjust the position of the racers according to the rules shown in Figure 1. Use variables to keep track of the positions of the racers (i.e., position numbers are 1–100). Start each racer at position 1 (the "starting gate"). If the racer slips before square 1, move it back to square 1 (i.e. no negative positions).




In each iteration of the simulation, move both racers and use the printf method to print the positions of each racer at the end of each iteration. If both racers land on the same square during the race, print the word IT's A TIE. When there is a winner, stop the race and indicate the winner; remember to use printf.




Begin the race by printing a proper message (e.g. On Your Mark, Get Set, Go)




You must include the following in your class:




At least one use of a static member variable



Overload the toString method. The method returns the string "Race simulation class".
 At least two methods in addition to main and toString

At least one use of WHILE loop statement



At least one use of FOR loop statement
At least one use of SWITCH statement
At the end of the race print the winner and the total number of iterations the program went through.



Hints:




 In order to simulate the percentages in Figure 1, generate a random integer


such that
1
. A 50% is achieved
if
1
, a 20% is achieved if
6


…


10


5
7








Each tick of the clock is a loop iteration. For example, 100 ticks on the clock are translated to 100 iterations. At the end of each iteration (tick) display the positions using printf as shown in Figure 2.
Think of the 100 square runway as shown below. A right move means, advance forward, a left move means backwards. Note that you do not need an array to represent the course.



start




















…
finish
1
2
3
4
5
6
7
8
9
10
11
…
100



Grading:






















































Item


Points






Comments








10








Static member








5








WHILE loop








5








FOR loop








5








Switch










5








Loop till one wins








10








Handling of logical errors (boundary checking)


10








Two additional methods








20








printf


the status at the end of every iteration


10




















10










correct winner and total time elapsed


10


Figures:


printf












100
































































Racer






Move Type


Percentage
Squares to move and direction










of the time
























#1


Jump




50%
3 Squares forwards




























Racer


Slip




30%
6 Square backwards


























Walk




20%
1 Square forward












































Sleep




10%
No moves at all


























#2


Jump




20%
5 Squares forwards




























Racer


Small slip


20%
2 squares backwards


























Slip




10%
10 Squares backwards




































Walk




40%
1 square forward


































Figure 1: Rules for adjusting the positions of the racers.

The City College of New York




Department of Compute Science

CSc 221: Software Design Laboratory















































































































































































Figure 2: Partial Sample Output Run – your results WILL differ