Consider the following class hierarchy:public final class Shape{private String mycolor:public Shape(String mycolor){this.tvpe = mvcolor:}public String getCoelor){return mycolor:}}public class Triangle extends Shape{public Triangle(String mycolor){super(mycolor);}}}What is wrong with this class hierarchy definition? Justify your choice.a) Nothing is wrong with the code.b) There should be more subclasses of the Shape class than just Triangle.c) There cannot be any subclasses of the Shape class.d) It is not possible to use super in the Triangle constructor.

I have given an answer in step 2.

What is wrong with this class hierarchy definition? Justify your choice. a) Nothing is wrong with the code. b) There should be more subclasses of the Shape class than just Triangle. c) There cannot be any subclasses of the Shape class. d) It is not possible to use super in the Triangle constructor.

What is wrong with this class hierarchy definition? Justify your choice. a) Nothing is wrong with the code. b) There should be more subclasses of the Shape class than just Triangle. c) There cannot be any subclasses of the Shape class. d) It is not possible to use super in the Triangle constructor.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

1. Create (the package) as (P1) and another as (P2). 4. Create a Class (GraduateStudent) inside (P2) according to the following: 2. Create an Interface (named Human) inside (P1) according to the following: • The Type constant takes the mammal. • The (Student) class inherits all of its variables and functions. (Print) function has no parameters and does not return a value Variables: 3. Create a student class inside P1 and apply the Human interface according to the • (Avg:) modified. following: (Status:) the status is of type text. It can be used without creating Variables: an Instance or Object instance. (Name): the name. And (No :) the number. Functions: [Marks]: A matrix of 5 numbers representing student marks in A construct that only initializes local variables. five subjects. • (Print) Eunction; do not inherit and print the student's rate and Eunctions: status. • construction reads from the keyboard the student's name, number (PrintAllInfo) Eunction: calls the (Print) function of…
Implement a nested class composition relationship between any two class types from the following list: Advisor Вook Classroom Department Friend Grade School Student Teacher Tutor Write all necessary code for both classes to demonstrate a nested composition relationship including the following: a. one encapsulated data member for each class b. inline default constructor using constructor delegation for each class c. inline one-parameter constructor for each class d. inline accessors for all data members e. inline mutators for all data members
add a class to package that represents your new drivable type. That type should be something that is capable of being driven (speeding up and slowing down) and therefore a perfect candidate for a class that implements the actions in the Drivable interface.
Suppose you are working on a project managing the bus fare of Dhaka metropolitan city. At this point you are designing a vehicle class(choose if you need to define it as an abstract class, interface or concrete class). After that, you need to create different classes such as Bus, Double_Decker_Bus, Mini_Bus, Regular_Bus and all of these classes will extend the Bus class. You are free to define the classes as you deem necessary. In the driver class, you must be able to call methods to print the bus fare per kilometer for double_decker bus, regular bus and mini bus(the fare should be different). You also need to calculate the bus fare of a route based on user input(in kilometers) to display the total bus fare for a single person. Adding to this, you will be able to calculate student fare based on the availability of the student ID card.
You need to perform following things to demonstrate the concept of abstract class. Step 1: Create the abstract class that has following methods. • Calculate the area of circle(Abstract method) • Calculate the area of triangle(Abstract method) • Calculate the area of rectangle(Method with implementation) Step 2: Create another class that extends above class and provide implementation of abstract methods. Step 3: Create the main method inside above class and display output of area of circle, area of triangle and area of rectangle. You need to submit the following things: • Java program with both the classes An output screenshot created using Microsoft Word
Write the constructor method for class Circle which is a subclass of Shape class. Class Shape has one attribute (color) and one constructor (with one parameter). Class circle has attribute for radius.
You need a means of guarding against unintentional corruption of class fields.
Now we are going to use the design pattern for collecting objects. We are going to create two classes, a class AmazonOrder that models Amazon orders and a class Item that models items in Amazon orders. An item has a name and a price, and the name is unique. The Item class has a constructor that takes name and price, in that order. The class also has getters and setters for the instance variables. This is the design pattern for managing properties of objects. The setName() method should do nothing if the parameter is the empty string, and the setPrice() method should do nothing if the parameter is not positive. The class also has a toString() method that returns a string representation for the item in the format “Item[Name:iPad,Price:399.99]”. For simplicity, we assume an Amazon order can have at most 5 items, and class AmazonOrder has two instance variables, an array of Item with a length of 5 and an integer numOfItems to keep track of the number of items in the…
Write a class about Aeroplane. Obviously, you will require other helper classes to complementyour airplane class. Design your classes yourself. The codes should contain the followingOOP features implemented in these classes:- Class- Object- Encapsulations- accessor/mutator- Method overloading- Objects as parameters- Objects as return type- Objects as fields- Association- Aggression- compositionBeside your code, comment the name of the feature that is implemented
For this assignment you will be building on your Fraction class. However, the changes will be significant, so I would recommend starting from scratch and using your previous version as a resource when appropriate. For this assignment, we will correctly handle Fractions that are negative, improper (larger numerator than denominator), or whole numbers (denominator of 1). Your class should support the following operations on Fraction objects: Construction of a Fraction from two, one, or zero integer arguments. If two arguments, they are assumed to be the numerator and denominator, just one is assumed to be a whole number, and zero arguments creates a zero Fraction. Use default parameters so that you only need a single function to implement all three of these constructors.You should check to make sure that the denominator is not set to 0. The easiest way to do this is to use an assert statement: assert(inDenominator != 0); You can put this statement at the top of your constructor. Note…