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SECTION B QUESTION 2: OBJECT-ORIENTATED PROGRAMMING Airlines store details of flights and passengers to assist staff in verifying information promptly - NSC Information Technology - Question 2 - 2017 - Paper 1
Question 2
SECTION B QUESTION 2: OBJECT-ORIENTATED PROGRAMMING Airlines store details of flights and passengers to assist staff in verifying information promptly. Do the fol... show full transcript
Worked Solution & Example Answer:SECTION B QUESTION 2: OBJECT-ORIENTATED PROGRAMMING Airlines store details of flights and passengers to assist staff in verifying information promptly - NSC Information Technology - Question 2 - 2017 - Paper 1
Step 1
2.1.1 Constructor:
Answer
To begin with, we create the constructor for the TFlight class. The constructor should include three parameters: flightNumber, city, and date. Each parameter must be assigned to their respective attributes within the class. Ensure the data types are correct, matching string for flightNumber and city, and date as a DateTime type. Finally, we need to call the setNumPassengers method within the constructor.
Step 2
2.1.2 Accessor methods:
Answer
Next, we will implement the accessor methods for the attributes. Each method should have the appropriate return type matching the attribute types. For example:
getFlightNumbershould return astringand retrieve theflightNumber.getNumPassengersshould return anintegerfornumPassengers.getCityshould return astringforcity.
Step 3
2.1.3 increasePassengers method:
Answer
We now need to create the increasePassengers method. This method should accept one parameter of type integer. Within the method, we will increase the value of numPassengers by the parameter value. Ensure you validate that numPassengers should not exceed the maximum capacity, possibly triggering an error or handling the overflow accordingly.
Step 4
Step 5
2.1.5 toString method:
Answer
In the toString method, we will create a string representation of the flight object. The method header should match the expected format. We need to concatenate the details of flightNumber, city, date, and numPassengers into a single formatted string output, ensuring clarity of the information.
Step 6
2.2.1 Button – Question 2.2.1:
Answer
To extract flight details from the combobox, first retrieve the selected item and process it to find the flight number. Additionally, manage the position of the hash character properly to ensure retrieval of flightNumber, city, followed by copying these values into their respective variables.
Step 7
2.2.2 Button – Question 2.2.2:
Answer
For this step, we will call the setNumPassengers method and ensure the object is instantiated using the correct arguments. We need to incorporate error handling when reading a line from the text file and checking if the flight object corresponds to any line. Implement checks to validate the flight object and invoke the increasePassengers method appropriately.
Step 8
2.2.3 Button – Question 2.2.3:
Answer
Lastly, for displaying the total passengers, we will call calPercBooked to calculate the booking percentage and display an appropriate message. If the percentage reaches 100%, provide a special message indicating "Fully Booked!". Finally, ensure to close the file properly to avoid any data loss.