Question 15 A class can inherit from just one base class, but it can implement multiple interfaces True False
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Question 15
A class can inherit from just one base class, but it can implement multiple interfaces
True
False
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Solved in 2 steps
- T/F1. Interface classes cannot be extended but classes that implement interfaces can be extended.T/F1. However, implementation classes may be extended, but interface classes cannot.Interfaces are used to define stronger is-a relationships because one class can inherit multiple interfaces. Ture or false
- The Critter class is a base class with some basic functionality for running simulations of different kinds of critters. Critters can move, act, and remember their history. A typical simulation contains a number of critters of different types. In each step of the simulation, the act member function will be called on each critter. Define a class Sloth derived from Critter that simulates a sloth. Sloths alternate between eating and sleeping. Add the word "eat" or "sleep" to the history each time the act function is called. The implementation of the Critter class is not shown. Complete the following file: sloth_Tester.cpp #include <iostream>using namespace std; #include "critter.h" /**A sloth eats and sleeps.*/class Sloth : public Critter{public:Sloth();. . .private:. . .}; Sloth::Sloth(){. . .} void Sloth::act(){if (...) {add_history("eat");...}else{add_history("sleep");... }} int main(){Sloth sloth;sloth.act();cout << sloth.get_history() << endl;cout <<…1. Why do you need to implement all the methods of an interface in class which implements an interface?Design a new Triangle class that extends the abstract GeometricObject class: Draw the UML diagram for the classes Triangle and GeometricObject Implement the Triangle class Write a test program that prompts the user to enter three sides of the triangle, a color, and a Boolean value to indicate whether the triangle is filled: The program should create a Triangle object with these sides and set the color and filled properties using the input The program should display the area, perimeter, color, and true or false to indicate whether it is filled or not
- T/F1. Interface classes cannot be expanded, but implementation classes may.Inheritance and PolymorphismThis assignment starts with the Account class from Labs 4 and 5.Our new and improved bank has two kinds of accounts, savings, and checking. In addition to an ID and a balance, savings accounts have an annual interest rate and a minimum balance. Checking accounts have a minimum balance and a monthly fee. Withdrawals and deposits can be made to both kinds of accounts. At the end of each month, savings accounts pay interest, but only if the account’s balance is above the minimum. Also at the end of each month,a fee is deducted from each checking account, but the fee is waived if the account’s balance is over the minimum. Tasks1.Create a complete UML diagram which shows the relationships between the three classes, Account, Savings, and Checkingand all of the fields and methods in each. The only modificationsrequired to the Account class is the addition of two abstract methodscalled closeMonth and accountString.2.The closeMonth function performs the appropriate…Person and Customer Classes Write a class named (Person) with data attributes for a person’s name, address, and telephone number. Provide accessors/getters and mutators/setters for each attribute. Write a displayPerson() to print out the attributes of the Person. Next, write a class named (Customer) that is a subclass of the (Person) class. The (Customer) class should have a data attribute for a customer number, and a Boolean data attribute indicating whether the customer wishes to be on a mailing list. Provide accessors/getters and mutators/setters for each attribute. Write a display customer() to print out the attributes of the Customer. Demonstrate an instance of the (Customer) class in a simple program.
- Library Management System Develop a Library Management system for borrowing and returning activities The basic classes could be the main Library, Subscribers, borrowing records, Contents, articles, e.t.c. NB: Contents may include books, journal articles or digital media. Also a subscriber may borrow books for one month, after which a fee accrue until the borrowed item is returned. On the other hand, golden subscribers may borrow for 2 months without fee before fees begin. Provides an interface for the user to: A. Adding/editing/deleting instances belonging to each class, B. Subscriber browsing library contents and select items to borrow. C. Subscriber returning borrowed item and check his balance and pay any late fee if any. D. Admin can print reports of overdue borrowed items.1. Design a new Triangle class that extends the abstract GeometricObject class. Draw the UML diagram for the classes Triangle and GeometricObject then implement the Triangle class. Write a test program that prompts the user to enter three sides of the triangle, a color, and a Boolean value to indicate whether the triangle is filled. The program should create a Triangle object with these sides, and set the color and filled properties using the input. The program should display the area, perimeter, color, and true or false to indicate whether it is filled or not.using java programmingPick the incorrect statement: O A class can implement more than one interface O A class can extend more than one classes O An interface can extend more than one interfaces O An interface cannot extend a class