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CS1331 Programming Exercise 05 – Sandwich Shop Solution
Problem Description
This programming exercise provides you some experience with creating programs that are object-oriented. You will build a class and work with instance data and non-static methods to help create sandwiches for the CS 1331 Sandwich Shop.
Solution Description
You will have one file named GTSandwich.java which will create a GTSandwich object for the sandwich artists to look at and create for the customers.
GTSandwich.java
1. Create a class called GTSandwich
2. GTSandwich has 7 private instance variables:
• A String variable called bread that stores the type of bread the customer wants.
• A String variable called meat that stores the meat the customer wants.
• A String array variable called extras that stores the various vegetables, sauces, or extras the customer wants.
• An int variable called numMeat that stores the number of meats the customer wants.
• A double variable called price that stores the cost of the sandwich.
• A boolean variable called hasSauce that stores whether the sandwich has the special GT house sauce.
• A boolean variable called makeCombo that stores whether the customer wants to make the sandwich a combo.
3. GTSandwich has these constructors:
• A constructor that takes in bread, meat, extras, numMeat, price, hasSauce, and makeCombo in this exact order. The constructor should correctly initialize the variables to the values passed in.
• A constructor that takes in bread, meat, and makeCombo in this order. This constructor sets the following defaults:
o number of meats should be 4, o cost should be 8.75,
o should have the special house sauce,
o and there should be no extras (a sandwich that has no extras should have an empty array).
• A zero-argument constructor which sets the following defaults: o bread is Rye, o choice of meat is Turkey,
o no extras (A sandwich that has no extras should have an empty array for extras),
o 4 slices of meat, o costs 8.75, o has the special house sauce, o and the sandwich is a combo in this order.
• Must use constructor chaining when possible.
4. The GTSandwich class has the following methods:
• Accessors/Getters and Mutators/Setters for every instance variable. Accessors return the value of private instance variables. Mutator methods are void, take in a parameter of the same type as the instance variable, and sets the value for that variable.
• The mutator for the makeCombo instance field, in addition to setting makeCombo, should increase the cost of the sandwich by 2 dollars if a true value is passed in and the current value of makeCombo is false (if it is true and a true value is passed in, do nothing). If a false value is passed in and the current value of makeCombo is true, then decrease the cost of the sandwich by 2 dollars (if the current value of makeCombo is false and a false value is passed in, do nothing).
• Method called applyCoupon that reduces the cost of the sandwich and increases the slices of meat. This method takes in a String representing a coupon code. If the coupon code is “CS1331” and the sandwich is a combo then you can apply the discount. The cost of the sandwich is reduced by 50% and the slices of meat are doubled and “Coupon Applied” is printed to the console. If the sandwich is not a combo or the coupon code is not correct then this method prints out “Coupon Not Applied” and does not apply the coupon.
• Method called applyCoupon that reduces the cost of the sandwich and makes the sandwich a combo for free. This method overloads the method described above. This method does not take in anything. If the cost is greater than or equal to 20 dollars, then the cost of the sandwich is reduced by 5 dollars and the order is made a combo (if the order is already a combo you should only apply the discount). If the discounts and changes are applied, then the method prints out
“Discount Applied” otherwise it prints out “Discount Not Applied”.
• Method called printExtras that prints out the extras a customer wants on their Sandwich. If the customer has no extras, then this method should print:
The customer wants no extras.
Otherwise, it should print:
The customer wants these extras: {extra 1}, {extra 2}, {extra 3}...
• A toString method that prints out a String representation of a Sandwich object in the following way. This method should have no parameters and return a String. The price should be rounded to 2 decimal places.
GT Sandwich that costs {price} with {bread}, {meat}, {extras},
{numMeat} slices of meat, Sauce: {hasSauce}, Combo: {makeCombo}.
Example Outputs:
In your main method do the following:
GTSandwich houseSpecial = new GTSandwich(“French”, “Turkey”, new String[]{“Banana Peppers”, “Spinach”, “Chipotle Mayo”}, 4, 10.75, true, true);
GTSandwich javaSandwich = new GTSandwich(); houseSpecial.applyCoupon(“CS1331”); javaSandwich.applyCoupon(); houseSpecial.printExtras();
System.out.println(houseSpecial);
System.out.println(javaSandwich);
This would print the following to the console:
Coupon Applied
Discount Not Applied
The customer wants these extras: Banana Peppers, Spinach, Chipotle Mayo
GT Sandwich that costs 5.38 with French, Turkey, Banana Peppers, Spinach,
Chipotle Mayo, 8 slices of meat, Sauce: true, Combo: true
GT Sandwich that costs 8.75 with Rye, Turkey, 4 slices of meat, Sauce: true, Combo: true
Checkstyle and Javadocs
You must run checkstyle on your submission. The checkstyle cap for this assignment is 5 points. If you don’t have checkstyle yet, download it from Canvas. Place it in the same folder as the files you want checkstyle. Run checkstyle on your code like so:
The message above means there were no Checkstyle errors. If you had any errors, they would show up above this message, and the number at the end would be points we would take off (limited to the amount we specified above). The Java source files we provide contain no Checkstyle errors. In future homeworks we will be increasing this cap, so get into the habit of fixing these style errors early!
Allowed Imports
Feature Restrictions
There are a few features and methods in Java that overly simplify the concepts we are trying to teach or break our auto grader. For that reason, do not use any of the following in your final submission:
• var (the reserved keyword)
• System.exit
Collaboration
No collaboration is allowed on this assignment. See syllabus for more details.
Turn-In Procedure
Submission
To submit, upload the files listed below to the corresponding assignment on Gradescope:
• GTSandwich.java
Make sure you see the message stating "PE05 submitted successfully". From this point, Gradescope will run a basic autograder on your submission as discussed in the next section.
Gradescope Autograder
For each submission, you will be able to see the results of a few basic test cases on your code. Each test typically corresponds to a rubric item, and the score returned represents the performance of your code on those rubric items only. If you fail a test, you can look at the output to determine what went wrong and resubmit once you have fixed the issue.
The Gradescope tests serve two main purposes:
• Prevent upload mistakes (e.g. non-compiling code)
• Provide basic formatting and usage validation
In other words, the test cases on Gradescope are by no means comprehensive. Be sure to thoroughly test your code by considering edge cases and writing your own test files. You also should avoid using Gradescope to compile, run, or Checkstyle your code; you can do that locally on your machine.
Important Notes (Don't Skip)
• Non-compiling files will receive a 0 for all associated rubric items
• Do not submit .class files
• Test your code in addition to the basic checks on Gradescope
• Run Checkstyle on your code to avoid losing points
• Submit every file each time you resubmit
• Read the "Allowed Imports" and "Restricted Features" to avoid losing points
• Check on Piazza for a note containing all official clarifications
This programming exercise provides you some experience with creating programs that are object-oriented. You will build a class and work with instance data and non-static methods to help create sandwiches for the CS 1331 Sandwich Shop.
Solution Description
You will have one file named GTSandwich.java which will create a GTSandwich object for the sandwich artists to look at and create for the customers.
GTSandwich.java
1. Create a class called GTSandwich
2. GTSandwich has 7 private instance variables:
• A String variable called bread that stores the type of bread the customer wants.
• A String variable called meat that stores the meat the customer wants.
• A String array variable called extras that stores the various vegetables, sauces, or extras the customer wants.
• An int variable called numMeat that stores the number of meats the customer wants.
• A double variable called price that stores the cost of the sandwich.
• A boolean variable called hasSauce that stores whether the sandwich has the special GT house sauce.
• A boolean variable called makeCombo that stores whether the customer wants to make the sandwich a combo.
3. GTSandwich has these constructors:
• A constructor that takes in bread, meat, extras, numMeat, price, hasSauce, and makeCombo in this exact order. The constructor should correctly initialize the variables to the values passed in.
• A constructor that takes in bread, meat, and makeCombo in this order. This constructor sets the following defaults:
o number of meats should be 4, o cost should be 8.75,
o should have the special house sauce,
o and there should be no extras (a sandwich that has no extras should have an empty array).
• A zero-argument constructor which sets the following defaults: o bread is Rye, o choice of meat is Turkey,
o no extras (A sandwich that has no extras should have an empty array for extras),
o 4 slices of meat, o costs 8.75, o has the special house sauce, o and the sandwich is a combo in this order.
• Must use constructor chaining when possible.
4. The GTSandwich class has the following methods:
• Accessors/Getters and Mutators/Setters for every instance variable. Accessors return the value of private instance variables. Mutator methods are void, take in a parameter of the same type as the instance variable, and sets the value for that variable.
• The mutator for the makeCombo instance field, in addition to setting makeCombo, should increase the cost of the sandwich by 2 dollars if a true value is passed in and the current value of makeCombo is false (if it is true and a true value is passed in, do nothing). If a false value is passed in and the current value of makeCombo is true, then decrease the cost of the sandwich by 2 dollars (if the current value of makeCombo is false and a false value is passed in, do nothing).
• Method called applyCoupon that reduces the cost of the sandwich and increases the slices of meat. This method takes in a String representing a coupon code. If the coupon code is “CS1331” and the sandwich is a combo then you can apply the discount. The cost of the sandwich is reduced by 50% and the slices of meat are doubled and “Coupon Applied” is printed to the console. If the sandwich is not a combo or the coupon code is not correct then this method prints out “Coupon Not Applied” and does not apply the coupon.
• Method called applyCoupon that reduces the cost of the sandwich and makes the sandwich a combo for free. This method overloads the method described above. This method does not take in anything. If the cost is greater than or equal to 20 dollars, then the cost of the sandwich is reduced by 5 dollars and the order is made a combo (if the order is already a combo you should only apply the discount). If the discounts and changes are applied, then the method prints out
“Discount Applied” otherwise it prints out “Discount Not Applied”.
• Method called printExtras that prints out the extras a customer wants on their Sandwich. If the customer has no extras, then this method should print:
The customer wants no extras.
Otherwise, it should print:
The customer wants these extras: {extra 1}, {extra 2}, {extra 3}...
• A toString method that prints out a String representation of a Sandwich object in the following way. This method should have no parameters and return a String. The price should be rounded to 2 decimal places.
GT Sandwich that costs {price} with {bread}, {meat}, {extras},
{numMeat} slices of meat, Sauce: {hasSauce}, Combo: {makeCombo}.
Example Outputs:
In your main method do the following:
GTSandwich houseSpecial = new GTSandwich(“French”, “Turkey”, new String[]{“Banana Peppers”, “Spinach”, “Chipotle Mayo”}, 4, 10.75, true, true);
GTSandwich javaSandwich = new GTSandwich(); houseSpecial.applyCoupon(“CS1331”); javaSandwich.applyCoupon(); houseSpecial.printExtras();
System.out.println(houseSpecial);
System.out.println(javaSandwich);
This would print the following to the console:
Coupon Applied
Discount Not Applied
The customer wants these extras: Banana Peppers, Spinach, Chipotle Mayo
GT Sandwich that costs 5.38 with French, Turkey, Banana Peppers, Spinach,
Chipotle Mayo, 8 slices of meat, Sauce: true, Combo: true
GT Sandwich that costs 8.75 with Rye, Turkey, 4 slices of meat, Sauce: true, Combo: true
Checkstyle and Javadocs
You must run checkstyle on your submission. The checkstyle cap for this assignment is 5 points. If you don’t have checkstyle yet, download it from Canvas. Place it in the same folder as the files you want checkstyle. Run checkstyle on your code like so:
The message above means there were no Checkstyle errors. If you had any errors, they would show up above this message, and the number at the end would be points we would take off (limited to the amount we specified above). The Java source files we provide contain no Checkstyle errors. In future homeworks we will be increasing this cap, so get into the habit of fixing these style errors early!
Allowed Imports
Feature Restrictions
There are a few features and methods in Java that overly simplify the concepts we are trying to teach or break our auto grader. For that reason, do not use any of the following in your final submission:
• var (the reserved keyword)
• System.exit
Collaboration
No collaboration is allowed on this assignment. See syllabus for more details.
Turn-In Procedure
Submission
To submit, upload the files listed below to the corresponding assignment on Gradescope:
• GTSandwich.java
Make sure you see the message stating "PE05 submitted successfully". From this point, Gradescope will run a basic autograder on your submission as discussed in the next section.
Gradescope Autograder
For each submission, you will be able to see the results of a few basic test cases on your code. Each test typically corresponds to a rubric item, and the score returned represents the performance of your code on those rubric items only. If you fail a test, you can look at the output to determine what went wrong and resubmit once you have fixed the issue.
The Gradescope tests serve two main purposes:
• Prevent upload mistakes (e.g. non-compiling code)
• Provide basic formatting and usage validation
In other words, the test cases on Gradescope are by no means comprehensive. Be sure to thoroughly test your code by considering edge cases and writing your own test files. You also should avoid using Gradescope to compile, run, or Checkstyle your code; you can do that locally on your machine.
Important Notes (Don't Skip)
• Non-compiling files will receive a 0 for all associated rubric items
• Do not submit .class files
• Test your code in addition to the basic checks on Gradescope
• Run Checkstyle on your code to avoid losing points
• Submit every file each time you resubmit
• Read the "Allowed Imports" and "Restricted Features" to avoid losing points
• Check on Piazza for a note containing all official clarifications
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