A class that is not intended to be instantiated, but used only as a base class, is called a(n) __________. a. dummy class b. subclass c. virtual class d. abstract class
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A class that is not intended to be instantiated, but used only as a base class, is called
a(n) __________.
a. dummy class
b. subclass
c. virtual class
d. abstract class
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- Using classes, design an online address book to keep track of the names, addresses, phone numbers, and dates of birth of family members, close friends, and certain business associates. Your program should be able to handle a maximum of 500 entries. Define a class addressType that can store a street address, city, state, and ZIP code. Use the appropriate functions to print and store the address. Also, use constructors to automatically initialize the member variables. Define a class extPersonType using the class personType (as defined in Example 10-10, Chapter 10), the class dateType (as designed in this chapters Programming Exercise 2), and the class addressType. Add a member variable to this class to classify the person as a family member, friend, or business associate. Also, add a member variable to store the phone number. Add (or override) the functions to print and store the appropriate information. Use constructors to automatically initialize the member variables. Define the class addressBookType using the previously defined classes. An object of the type addressBookType should be able to process a maximum of 500 entries. The program should perform the following operations: Load the data into the address book from a disk. Sort the address book by last name. Search for a person by last name. Print the address, phone number, and date of birth (if it exists) of a given person. Print the names of the people whose birthdays are in a given month. Print the names of all the people between two last names. Depending on the users request, print the names of all family members, friends, or business associates.Programming Language = Python 1. Employee and ProductionWorker Classes Write an Employee class that keeps data attributes for the following pieces of information: • Employee name • Employee number Next, write a class named ProductionWorker that is a subclass of the Employee class. The ProductionWorker class should keep data attributes for the following information: • Shift number (an integer, such as 1, 2, or 3) • Hourly pay rate The workday is divided into two shifts: day and night. The shift attribute will hold an integer value representing the shift that the employee works. The day shift is shift 1 and the night shift is shift 2. Write the appropriate accessor and mutator methods for each class. Once you have written the classes, write a program that creates an object of the ProductionWorker class and prompts the user to enter data for each of the object’s data attributes. Store the data in the object and then use the object’s accessor methods to retrieve it and display it on the…A class is made abstract by declaring that class virtual. T/F
- Child Class: Vegetable Write a child class called Vegetable. A vegetable is described by a name, the number of grams of sugar (as a whole number), the number of grams of sodium (as a whole number), and whether or not the vegetable is a starch. Core Class Components For the Vegetable class, write: the complete class header the instance data variables a constructor that sets the instance data variables based on parameters getters and setters; use instance data variables where appropriate a toString method that returns a text representation of a Vegetable object that includes all four characteristics of the vegetableJavaParent Class: Food Write a parent class called Food. A food is described by a name, the number of grams of sugar (as a whole number), and the number of grams of sodium (as a whole number). Core Class Components For the Food class, write: the complete class header the instance data variables a constructor that sets the instance data variables based on parameters getters and setters; use validity checking on the parameters where appropriate a toString method that returns a text representation of a Food object that includes all three characteristics of the food Class-Specific Method Write a method that calculates what percent of the daily recommended amount of sugar is contained in a food. The daily recommended amount might change, so the method takes in the daily allowance and then calculates the percentage. For example, let's say a food had 6 grams of sugar. If the daily allowance was 24 grams, the percent would be 0.25. For that same food, if the daily allowance was 36 grams, the…__________ allows a base class reference variable to reference a derived class object. a. Polymorphism b. Inheritance c. Generalization d. Specialization
- Design an Employee class that has fields for the following pieces of information:• Employee name• Employee numberNext, design a class named ProductionWorker that extends the Employee class. The ProductionWorker class should have fields to hold the following information:• Shift number• Hourly pay rateThe workday is divided into shifts: day and night. The shift field will hold an int value representing shift that the employee works. The day sifts is shift 1 and the night shift is shift 2. Design the appropriate accessor and mutator methods for each class.Once you have designed the classes, design a program that creates an object of the ProductionWorker class and prompts the user to enter data for each of the object’s fields. Store the data in the object and then use the object’s accessor methods to retrieve it and display it on the screen.Program Sample Run #1The worker name is John RobinsThe worker number is 1234The shift is 1The rate is 36.01. Employee and ProductionWorker Classes Write an Employee class that keeps data attributes for the following pieces of information: Employee name Employee number Next, write a class named ProductionWorker that is a subclass of the Employee class. The ProductionWorker class should keep data attributes for the following information: Shift number (an integer, such as 1, 2, or 3) Hourly pay rate The workday is divided into two shifts: day and night. The shift attribute will hold an integer value representing the shift that the employee works. The day shift is shift 1 and the night shift is shift 2. Write the appropriate accessor and mutator methods for each class. Once you have written the classes, write a program that creates an object of the ProductionWorker class and prompts the user to enter data for each of the object’s data attributes. Store the data in the object, then use the object’s accessor methods to retrieve it and display it on the screen. 2. ShiftSupervisor Class In a…Fill in the blank: A(n)________specifies how a class member can be accessed by code outside the class.
- Look at the following class definitions:class Plant:def _ _init_ _(self, plant_type):self._ _plant_type = plant_typedef message(self):print("I'm a plant.")class Tree(Plant):def _ _init_ _(self):Plant._ _init_ _(self, 'tree')def message(self):print("I'm a tree.")Given these class definitions, what will the following statements display?p = Plant('sapling')t = Tree()p.message()t.message()The entire list of parent classes from which a child class is derived constitutes the ____ of the subclass. a. children b. derivatives c. subordinates d. ancestorsWrite a complete abstract class named Store with the following members: 1. Item number 2. quantity: number of items 3. abstract method TotalPrice which calculate and returns the total price as quantity*price. 4. Aconstructor which initialize the item number and quantity. Part B: Write a class named Items which inherits from the previous class (Store) and contains the following members: 1. itemName: The name of the item. 2. price: Item price 3. A constructor to initialize the properties. 4. A method Bill() which prints the item name, price, quantity, and total price. Part C: Write a class which contains the method Main and create an instance of the class Items and call the method Bill properly.