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Java Programming

 Write a program to allow a human to play a game of Rock, Paper, Scissors versus the computer.

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS

Description: Write a program to allow a human to play a game of Rock, Paper, Scissors versus the computer. The sample programs (rps1.txt, rps2.txt, and rps3.txt) show 3 runs from my solution to this problem using the default computer player. You must use the given computer player class so the choices are predictable. This is necessary to that we can grade your program. If you were writing the program for yourself you would of course make the computer choices random. But the program you turn in must use the predictable choices generated by the given computer player class.

Given the same human name and computer choices, your program must match this output exactly. Use a diff tool such as the one at this website ( www.quickdiff.com) to ensure your program produces the correct output. Even minor differences in characters will cause you to fail grading tests and lose points.

The program:

  • Asks the user for their name
  • Asks the user how many rounds of Rock, Paper, Scissors they want to play
  • Plays that many rounds of the game
  • for each round of the game
    • asks the user for their choice
    • have the computer make a random choice
    • prints out each player's choice
    • prints the results of the round
  • After playing the specified number of rounds, displays the number or rounds the user won, the number of rounds the computer won, and the number of rounds that were a draw
  • Declares who the better player was based on the number of wins

This is not an easy program, mostly due to the size of the program. The individual steps are not too difficult, but their are many steps. The program description above gives you a rough idea of how to break the program up into parts.

Have a high level structure and then implement parts of that structure (the individual methods) one at a time, testing to make sure they work before going on. You may have to write some testing code that will not be part of the final program. Do not write the whole program in main and then try and break it up into methods.

Here are some tips on the various parts of the program.

  1. Main method.

The main method creates the an object of type RandomPlayer. If no values are sent to main a default RandomPlayer is created. If you send an argument to the main method it is assumed it is a single value that can be parsed to an int. (These pages describe how to send an argument to the main method in BlueJ or Eclipse). Pass the RandomPlayer object to the methods that need it. Feel free to share examples of your output for non default players on Piazza.

In the main program declare a Scanner variable that is hooked up to System.in. You must include the line of code

import java.util.Scanner;

at the top of your program.

Pass the Scanner object you create as a parameter to any methods that need it. The main method should not have a lot of statements, instead it shall call other methods. Do not create multiple Scanners. Create one Scanner connected to System.in and pass that object to the methods that need it. If you create more than one Scanner in your program connected to System.in (Scanner sc = new Scanner(System.in);) you will fail, many many of our tests and lose a lot of correctness points.

  1. Ask the user for their name. This is a good candidate for a separate method that returns a String.
  2. Ask the user how many rounds of Rock, Paper, Scissors they want to play. This is another good candidate for a separate method that returns an int. You do not have to do any error checking on the user input. If they enter something that is not an int it is appropriate for the program to end due to a runtime error.
  3. Playing the rounds of the gameGiven our current programming tools this will be the largest and most complex method. It is in turn broken down into several parts. You will need a number of local variables in this method.
  4. Ask the user what their choice is. The user will enter an integer as their choice. You do not need to error check their input.
  5. Have the computer make a random choice. To do this call the getComputerChoice method on the RandomPlayer object created in main and passed as a parameter.

You must use the provided RandomPlayer.java file. Do not change it.. Do not use Random() (from java.util) directly and do not use Math.random().  Keep RandomPlayer.java in a separate file. Do not turn in RandomPlayer.java.

  1. Print out each player's choice. You will find it useful to have a method that is passed an  int parameters and returns the correct String for that int. In this program 1 represents "Rock", 2 represents "Paper", and 3 represents "Scissors".
  2. Print the results of that round.This is the most algorithmically difficult part of the assignment because there are nine possible outcomes and using the programming tools of chapters 1 - 4 and section 5.3 it is difficult to remove redundancy.

The nine possible outcomes are

Computer Choice

Human Choice

Result

Rock

Rock

Draw

Rock

Paper

Human Wins

Rock

Scissors

Computer Wins

Paper

Rock

Computer Wins

Paper

Paper

Draw

Paper

Scissors

Human Wins

Scissors

Rock

Human Wins

Scissors

Paper

Computer Wins

Scissors

Scissors

Draw

You must follow the format as shown in the sample output.

  1. After playing the specified number of rounds display how time the user won, how many times the computer won, and how many draws occurred.  The method that runs the rounds shall call a method to display this information.

10. Declare who the better player was based on the number of wins.  This can be part of the results method but will require some conditional execution with if statements.

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