Program Specifications: Write A Self-Checkout Kiosk Class

Program Specificationswrite A Selfpaykiosk Class To Support Basic Oper

Program Specificationswrite A Selfpaykiosk Class To Support Basic Oper

Program Specifications Write a SelfPayKiosk class to support basic operations such as scan item, cancel transaction, checkout, and make payment. SelfPayKiosk.java is provided with method stubs. Follow each step to gradually complete all methods. Note: This program is designed for incremental development. Complete each step and submit for grading before starting the next step. Only a portion of tests pass after each step but confirm progress. The main() method in LabProgram.java includes basic method calls. Add statements in main() as methods are completed to support development mode testing. Step 0. Declare private fields for number of customers served (int), total sales (double), and current amount due (double). Note the provided final variable for sales tax of 7%. Step 1 (1 pts). 1) Complete the constructor to initialize all private fields to zero. 2) Complete the accessor methods to return the number of customers served, total sales, and current amount due. Submit for grading to confirm 1 test passes. Step 2 (2 pt). Complete the scanItem() method. Increase the amount due by parameter price. Do not update amount due if parameter price is negative. Submit for grading to confirm 3 tests pass. Step 3 (1 pt). Complete the checkOut() method. Multiply amount due by SALES_TAX and add to amount due. Submit for grading to confirm 4 tests pass. Step 4 (2 pts). Complete the makePayment() method. If parameter payment is enough to pay the amount due, increase total sales by amount due, increment number of customers served, and reset amount due to zero in preparation for the next customer. However, if parameter payment is not enough, update total sales by payment and reduce amount due by payment. Do not make any changes if parameter payment is negative. Submit for grading to confirm 6 tests pass. Step 5 (1 pt). 1) Complete the resetKiosk() method to reset all private fields to zero. 2) Complete the cancelTransaction() method to reset amount due to zero. Submit for grading to confirm 7 tests pass. Step 6 (2 pts). Complete the simulateSales() method to perform multiple transactions with increasing prices. Use a loop to simulate parameter numSales transactions. Within the loop, call scanItem() with parameter initialPrice. Call checkOut() and makePayment() to make a payment of $1 more than the amount due. Finally, increase the item price by parameter incrPrice in preparation for the next transaction. Submit for grading to confirm 8 tests pass. Step 7 (1 pt). Add a boolean private field to indicate if the customer has checked out and is ready to make a payment. Only allow payment after customer has checked out. The cancelTransaction() method should not reset amount due if the customer has checked out. Update the following methods by inserting assignment statements and if statements related to the boolean field: constructor, checkOut(), makePayment(), and cancelTransaction(). Ex: Set the boolean field to false only after full payment has been made. Submit for grading to confirm all tests pass.

Paper For Above instruction

Implementation of SelfPayKiosk class supporting basic operations

The development of the SelfPayKiosk class is a structured process that involves incremental additions of features to support essential functionalities of a self-service payment kiosk. The implementation begins with defining the core private fields to track customer interactions, specifically the number of customers served, total sales, and the current amount due from the customer. Beginning with step 0, these fields are declared as private variables, with int and double types accordingly. Additionally, a constant sales tax rate of 7% (represented as a final variable) is provided and used throughout the calculations.

In step 1, the constructor is completed to initialize all counters and amounts to zero, ensuring a fresh state whenever a new kiosk instance is created. Accessor methods are also added to retrieve the current number of customers served, total sales made, and current amount due. These methods encapsulate the private fields, following object-oriented principles of data hiding.

Step 2 introduces the scanItem method, which updates the amount due based on the price of an scanned item. To maintain data integrity, negative prices are ignored, accurately reflecting real-world scenarios where item prices cannot be negative.

The checkout process, handled in step 3, applies sales tax to the current amount due by multiplying it with the tax rate and adding it to the amount owed. This simulates the addition of tax during a real transaction before payment is made.

Step 4 involves the makePayment method, responsible for processing customer payments. If the payment covers the entire amount due, the total sales are increased by that amount, the customer count increases, and the amount due is reset, preparing the kiosk for the next customer. Partial payments reduce the amount due accordingly, and invalid (negative) payments are ignored to prevent data corruption.

Further, step 5 introduces methods for resetting the entire kiosk to an initial state and canceling a transaction. The reset method clears all counters and amounts, whereas the cancel method resets only the current amount due, enabling a customer to abort the current transaction without affecting total sales or customer count.

In step 6, a simulation method is created, which multiple sales transactions with incrementally increasing item prices. This tests the class’s ability to handle multiple sequential operations, accumulate sales, and adapt to changing input data.

Finally, step 7 adds a boolean indicator to track whether a customer has completed checkout and is positioned to make a payment. This restriction ensures that payments are only processed after checkout, mimicking real-world kiosk behavior. The cancelTransaction method also respects this state, avoiding unintended reset of the amount due if a customer has already checked out.

Throughout development, each step’s changes are designed to pass specific sets of tests, enabling verification of correctness at each stage. This incremental approach allows for systematic troubleshooting and ensures functional robustness of the SelfPayKiosk class in a real-world scenario.

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