What would be the effect of the following code: public class Body Part { } public class Leg extends Body Part { } Leg 1 = new BodyPart(); A compiler error because we can not use a different reference type than the variable declared type. O The code will compile but will result in a runtime error. O A compiler error because a subclass reference variable cannot be assigned a superclass object. O Nothing. The code will compile without any errors.

What would be the effect of the following code: public class Body Part { } public class Leg extends Body Part { } Leg 1 = new BodyPart(); A compiler error because we can not use a different reference type than the variable declared type. O The code will compile but will result in a runtime error. O A compiler error because a subclass reference variable cannot be assigned a superclass object. O Nothing. The code will compile without any errors.

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

Computer Science There are clearly some similarities in the implementations of Taxi and Shuttle that suggest use of inheritance to represent them. Introducing inheritance is the primary task of this assessment. -The Ezcab class, The Ezcab class maintains separate lists of taxis and shuttles and destinations with destination fares (you can hardcode destination fares). It has a lookup method that searches for a taxi/shuttle with a given ID. -The Taxi and Shuttle classes share some common attributes – location and destination. They also have some common methods – getLocation, getDestination, getStatus and setDestination. -Vehicle is the superclass of both Taxi and Shuttle. This class involves placing the common fields and methods into Vehicle and removing them from Taxi and Shuttle. -Modify Taxi and Shuttle class to indicate that it is a subclass of Vehicle. You can keep the id field in Vehicle class and getId,SetId methods. -Arrange for Taxi's constructor to call the constructor of…
USING PYTHON LANGUAGE When prompting the user you must always include text which lets the user know what should be inputted. Write a program that creates a class named Person with three instance attributes: name, address, and cell_number as strings. Next, create a class named Customer (subclass) that inherits from the Person class. The Customer class should have two additional instance attributes: customer_number as a string. on_mailing_list as a boolean. Each class should include _init_) and _str-0 methods. The Customer class-_init__) and _str_-) methods must make a call to super) to access the Person's methods. After the Customer code, prompt the user to enter a name, address and cell_number for a person. Instantiate a Person object by passing in the user's input as the arguments and print out the Person's attributes by calling the -str-0 method. Next, prompt the user to enter a name, address, cellnumber, customer_number and on_mailing_list for a customer. Instantiate a Customer…
Wtite a program in java language also give source code and output also.
Please help with the following: Consider the following Python code:class MyClass: attr = 10a. "altr" is MyClass's instance attribute.b."attr" is MyClass's static attribute.c."attr" is a non-local variable.d."attr" is a local variable.
please solve in python languange and use proper comments for better understanding . Thank you.
I'm learning java in college and I missed one homework assignment. Since then it has been difficult to keep up with homework because they were based on the one I missed. Here's the prompt: Design a class Phone with one data member as long phoneNumber. Add constructors, get/set methods to class Phone. Then design a class InternationalPhone as subclass of class Phone, with one extra data member as int countryCode. Add constructors, get/set methods to class InternationalPhone. Write a main program to test these two classes. (We use netbeans btw) I can't get any credit for this so there's no rush but I would be very happy to recieve an answer before the end of the semester. Thank you in advance :)
Form a subclass StateQuarter from the class Coin. A state quarter has a state theme. The toString method should yield a string such as StateQuarter[value=0.25,name=Quarter][state=California] /** A quarter with a state theme.*/public class StateQuarter extends Coin{ // Type your code here /** Constructs a state quarter. @param aState the state name */ public StateQuarter(String aState) { super(0.25, "Quarter"); // Type your code here } /** Gets the description of this object. @return a description of this coin */ public String toString() { // Type your code here }}
Please give me correct solution.
QUESTION 16 What must be true of a class with one abstract method? O The class must also implement the Iterable interface Any derived class must implement the method The abstract method must have the static modifier O The method cannot specify a return value QUESTION 17 Suppose we wanted to design a set of classes for a veterinarian's office. Our Customer class looks like this: public class Customer { Pet [] pets; } Select all the statements that are true Once the size of the pets array has been set, it cannot be changed Because we're using an array, all pets must be the same A customer must have at least one pet We also need to declare a Pet class QUESTION 18 What is the proper use of an enumeration? To define a set of ordered values To enforce the use of the Comparable interface O To define, or enumerate, the values returned by a Random object generator O To define the classes in an inheritance hierarchy
What is the design pattern depicted in the diagram below? The intent of this design pattern is to define an interface for creating an object, but let subclasses decide which class to instantiate. It lets a class defer instantiation to subclasses. Client Abstraction normalMethodoe BmakeObjecto Product do some stuff aProduct = makeObjecto: f do some more stuff -aProduct Product ConcreteOne ConcreteTwo makeObjecto : Product ProductOne ProductTwo return new ProductOneo. A. Factory Method Design Pattern B. Singleton Design Pattern C. Proxy Design Pattern D. Adapter Design Pattern
{In Java Programming Please} Create a class hierarchy that represents different types of employees in a company. Start with a class called Employee that has two methods: calculateSalary() and displayDetails(). Then, create two subclasses of Employee: Manager and Engineer. Override the calculateSalary() method in both subclasses to calculate the salary based on their job role and experience. Override the displayDetails() method in both subclasses to print out a message indicating the details of the employee. Next, create another class called Salesperson that extends Employee and has a method called calculateCommission(). Create two subclasses of Salesperson: SeniorSalesperson and JuniorSalesperson. Override the calculateCommission() method in both subclasses to calculate the commission based on their sales performance. Override the displayDetails() method in both subclasses to print out a message indicating the details of the salesperson. In the main method, create objects of each class…
Answer with True or False for the following. Explain your answers.-It is legal to write a method in a class which overloads another method declared in the same.-It is legal to write a method in a superclass which overrides a method declared in a sub-class.