Rock paper scissors
Open the challenge
From Java Bootcamp Resources -> Module 1 -> 4. Functions, open Challenge 4.
Task 1: See if the user wants to play
Use Scanner to pick up the user's response.
>>Let's play Rock Paper Scissors.
>>When I say 'shoot', Choose: rock, paper, or scissors.
>>
>>Are you ready? Write 'yes' if you are
Task 2: Set up the game.
- if the answer is yes:
-- print: Great!
-- print: rock -- paper -- scissors, shoot!
-- pick up user's choice.
-- get the computer choice (can be done after task 3).
-- get the result (can only be done after task 4)
-- print everything (can only be done after task 5).
- else:
-- print: Darn, some other time...!Here, the user would enter rock paper or scissors. Using Scanner, pick up their choice.
- if the answer is yes:
-- print: Great!
-- print: rock -- paper -- scissors, shoot!
-- pick up user's choice. <----------
-- get the computer choice (can be done after task 3).
-- get the result (can only be done after task 4)
-- print everything (can only be done after task 5).
- else:
-- print: Darn, some other time...There are more instructions for the if statement. You cannot do them until you finish tasks 3, 4, and 5.
- if the answer is yes:
-- print: Great!
-- print: rock -- paper -- scissors, shoot!
-- pick up user's choice.
-- get the computer choice (can be done after task 3). <------
-- get the result (can only be done after task 4) <-------
-- print everything (can only be done after task 5). <--------
- else:
-- print: Darn, some other time...So, you're left with the else block. If the user doesn't enter "yes", print: Darn, some other time...!
- if the answer is yes:
-- print: Great!
-- print: rock -- paper -- scissors, shoot!
-- pick up user's choice.
-- get the computer choice (can be done after task 3).
-- get the result (can only be done after task 4)
-- print everything (can only be done after task 5).
- else: <---------------
-- print: Darn, some other time... Task 3: Generate a random choice
You'll write a function that picks randomly between rock paper scissors.
- Function name:
/** * Function name: computerChoice <-------- * @return a choice (String). * * Inside the function: * 1. Picks a random number between 0 and 2. * 2. if 1: return the choice 'rock' * if 2: return the choice 'paper' * if 3: return the choice 'scissors' */
-
Parameters: The function takes no parameters.
-
Return type:
/** * Function name: computerChoice * @return a choice (String). <------ * * Inside the function: * 1. Picks a random number between 0 and 2. * 2. if 0: return the choice 'rock' * if 1: return the choice 'paper' * if 2: return the choice 'scissors' */
Inside the function, generate a random number between 0 and 2. Based on the result, return rock, paper or scissors.
/** * Function name: computerChoice * @return a choice (String). * * Inside the function: <---------- * 1. Picks a random number between 0 and 2. * 2. if 0: return the choice 'rock' * if 1: return the choice 'paper' * if 2: return the choice 'scissors' */
Call the function and store the computer choice.
- if the answer is yes:
-- print: Great!
-- print: rock -- paper -- scissors, shoot!
-- pick up user's choice.
-- get the computer choice (can be done after task 3). <------------
-- get the result (can only be done after task 4)
-- print everything (can only be done after task 5).
- else:
-- print: Darn, some other time...Test your code
Add two temporary print statements.
- if the answer is yes:
-- print: Great!
-- print: rock -- paper -- scissors, shoot!
-- pick up user's choice.
-- get the computer choice (can only be done after task 3)
System.out.println("\nYou chose: " + yourChoice); <---------
System.out.println("The computer chose: " + computerChoice); <--------
-- get the result (can only be done after task 4)
-- print everything (can only be done after task 5).
- else:
-- print: Darn, some other time...The end result should print your choice and the computer's choice.
Run it a few more times, and make sure the computer is picking randomly.