Concept explainers
E-Mail Address Book
Create an application with a class named PersonEntry. The PersonEntry class should have properties for a person’s name, e-mail address, and phone number. Also, create a text file that contains the names, e-mail addresses, and phone numbers for at least five people. When the application starts, it should read the data from the file and create a PersonEntry object for each person’s data. The PersonEntry objects should be added to a List, and each person’s name should be displayed in a list box on the application’s main form. When the user selects a name from the list box, a second form should appear displaying that person’s name, e-mail address, and phone number.
Want to see the full answer?
Check out a sample textbook solutionChapter 9 Solutions
Starting out with Visual C# (4th Edition)
Additional Engineering Textbook Solutions
Absolute Java (6th Edition)
Computer Systems: A Programmer's Perspective (3rd Edition)
Digital Fundamentals (11th Edition)
Software Engineering (10th Edition)
C Programming Language
Problem Solving with C++ (10th Edition)
- The operator used to create objects is = += new createarrow_forwardClass Assignment This object represents a school assignment that a student will work on. __init__(self, name: str, difficulty: float): """ Constructs an assignment with the given assignment name and a float that indicates the level of difficulty of the assignment. :param name: The name of the assignment :param difficulty: The level of difficulty of the assignment """ get_name(self) -> str: """ Returns the name of the assignment as specified in the constructor. :return: The assignment name """ get_difficulty(self) -> str: """ Returns the level of difficulty of the assignment as specified in the constructor. :return: The assignment level """ __str__(self) -> str: """ Returns the name of the assignment as specified in the constructor. :return: The assignment name """arrow_forwardCar Class Project The car classwill havethe following attributes: •year: an integer that holds the car's model year •model: a string that holds the make of the car •make: a string that holds the model of the car •speed: an integer that holds the car's current speed Your class should contain thefollowing: A docstring that briefly describes the class and lists the attributes. The docstring will serve as the documentation for your class. •A constructor (__init__ method) that takes the car's year model and make as optional arguments. The constructor will set the value of the speed attribute to 0.•An __str__ method that returns the car's year model and makein a string. •To test your class, create acar object and use the print function to verify that the constructor and __str__ methodsare working correctly. •An accessor method which returns the value stored in the speed instance variable. Call this method getSpeed(). •A modifier method called accelerate() which adds 5 to the speed variable…arrow_forward
- Book Donation App Create a book-app directory. The app can be used to manage book donations and track donors and books. The catalog is implemented using the following classes: 1. The app should have donors-repo.js to maintain the list of donors and allow adding, updating, and deleting donors. The donor object has donorID, firstName, lastName, and email properties. This module should implement the following functions: • getDonor(donorId): returns a donor by id. • addDonor(donor): adds a donor to the list of donors; donorID should be autoassigned a random number. • updateDonor(donor): updates the donor having the matching donorID. • deleteDonor(donorID): delete the donor with donorID from the list of donors, only if they are not associated with any books. 2. The app should have books-repo.js to maintain the list of donated books and allow adding, updating, and deleting books. The book object has bookID, title, authors, and donorID properties. • donorID references the book’s donor. This…arrow_forwardA student record has the following:Student nameStudent surnameStudent NumberFinal markFGrade comment Create a StudentRecord class, complete with accessors and mutators (get and set methods) for theinstant variables as well as the toString method for formatting the object.The StudentRecord class must have an abstract method called calculatefinalMarkAn IT student has Test1, Test2 and Test3. The IT student's final mark is calculated as (Test1*0.2 +Test2*0.3 + Test3*0.5). The subminimum for a pass is 40% on Test3. ITStudentRecordAn Accounting student has Test1 and Test2. The Accounting student's final mark is calculated as(Tes1*0.4 + Test2*0.6). The subminimum for a pass is 40% on Test2. AccountingStudentRecordBoth the sub classes must have at least two constructors, one with null argument and one with allpertinent instance variables.PS. The final mark and the grade comment cannot be instance variables.The grade comment can be a pass with distinction if the final mark is 80% or greater.…arrow_forwardCar Class Project The car classwill havethe following attributes: •year: an integer that holds the car's model year •model: a string that holds the make of the car •make: a string that holds the model of the car •speed: an integer that holds the car's current speed Your class should contain thefollowing: A docstring that briefly describes the class and lists the attributes. The docstring will serve as the documentation for your class. •A constructor (__init__ method) that takes the car's year model and make as optional arguments. The constructor will set the value of the speed attribute to 0.•An __str__ method that returns the car's year model and makein a string. •To test your class, create acar object and use the print function to verify that the constructor and __str__ methodsare working correctly. •An accessor method which returns the value stored in the speed instance variable. Call this method getSpeed(). •A modifier method called accelerate() which adds 5 to the speed variable…arrow_forward
- Complete the following tasks: Design a class named StockTransaction that holds a stock symbol (typically one to four characters), stock name, and price per share. Include methods to set and get the values for each data field. Create the class diagram and write the pseudocode that defines the class. Design an application that declares two StockTransaction objects and sets and displays their values. Design an application that declares an array of 10 StockTransactionobjects. Prompt the user for data for each object, and then display all the values. Design an application that declares an array of 10 StockTransactionobjects. Prompt the user for data for each object, and then pass the array to a method that determines and displays the two stocks with the highest and lowest price per share.arrow_forward7. Employee Management System This exercise assumes you have created the Employee class for Programming Exercise 4. Create a program that stores Employee objects in a dictionary. Use the employee ID number as the key. The program should present a menu that lets the user perform the following actions: Look up an employee in the dictionary Add a new employee to the dictionary Change an existing employee’s name, department, and job title in the dictionary Delete an employee from the dictionary Quit the program When the program ends, it should pickle the dictionary and save it to a file. Each time the program starts, it should try to load the pickled dictionary from the file. If the file does not exist, the program should start with an empty dictionary.arrow_forwardCreate the StockTask1 Java project Create a Stock object class that contains the following information: The symbol of the stock is stored in a private string data field called symbol. The stock's name is stored in a private string data field called name. previousClosingPrice is a private double data area that stores the stock price for the previous day. currentPrice is a private double data area that stores the stock price at the current time. A constructor for creating a stock with the given symbol and name. For the data fields, there are accessor methods (get-methods). For the data fields, there is a mutator method (set-methods). A method named getChangePercent()that returns the percentage changed from previousClosingPrice to currentPrice. Formula:perc_change = (current price - previous closing price) / previous closing price x 100 Create a test class named testStockthat creates a Stockobject with the stock symbol SUNW, the name Sun Microsystems Inc., and the previous closing…arrow_forward
- A. Car Class Create a Python Program where you write a class named Car that has the following data attributes: • _ _year_model (for the car's year model) • __make (for the make of the car) • _ _speed (for the car's current speed) The Car class should have an _init_ method that accepts the car's year model and make as arguments. These values should be assigned to the object's _year_model and make data attributes. It should also assign 0 to the __speed data attribute. The class should also have the following methods: accelerate() The accelerate method should add 5 to the speed data attribute each time it is called. brake() The brake method should subtract 5 from the speed data attribute each time it is called. • get_speed() The get_speed method should return the current speed. Next, design a program that creates a Car object then calls the accelerate method five times. After each call to the accelerate method, get the current speed of the car and display it. Then call the brake method…arrow_forwardWhen we use the Group-Object cmdlet, it will create this new property, which displays the number of objects in each grouping: Group of answer choices Number Count Entry Namearrow_forwarddesign a Club class and use it to create an application that simulates asoccer league tournament. You are not limited to the features included in these instructionsDesign the Club class, to be used in your application, containing: A private data member code of type string that holds the three letters club’s abbreviation(ex, FCB, LIV, RAM ...) A private data member name of type string that holds the club’s name (ex, FC Barcelona,Liverpool, Real Madrid …) A private data member round of type integer that holds the number of rounds the club hasplayed so far in the current league. A private data member wins of type integer that holds the number of times the club haswon in the current league. A private data member draws of type integer that holds the number of times the club hasbeen drawn in the current league. A private data member losses of type integer that holds the number of times the club haslost in the current league. A private data member goals of type integer that holds the…arrow_forward
- Programming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:CengageEBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENTMicrosoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,