Remaining Time: 14 minutes, 10 seconds.Question Completion Status:QUESTION 1What is the scope of a private instanceable?All classes in the same package as the class in which the variable is defined.Only the method in which the variable is defined.The entire class in which the variable is defined.The entireprogram.QUESTION 2When an ohiect is created it wilL fin

The class's instance variables are shared by all of the class's methods and can be marked as public…

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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

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QUESTION 2 What is the scope of a private instance variable? O Only the method in which the variable is defined. O The entire class in which the variable is defined. O All classes in the same package as the class in which the variable is defined. O The entire program. QUESTION 3 All Enumeration types are variable type O True O False QUESTION 4 A constructor cannot: O Specify return types or return values. O Initialize variables to their defaults. O Be overloaded. O Have the same name as the class. Click Save and Submit to save and submit. Click Save All Answers to save all answers. 33°C yub
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
If the programmer doesn't declare any constructors for an extended class, what constructors will be inherited from the superclass? How does this inherited constructor initialize new instance variables that are not part of the superclass? Suppose that Vehicle is a class and Car is a new class that extends Vehicle. Write a description of which kind of assignments are permitted between Car and Vehicle variables. Suppose you write a new constructor for an extended class. Describe two different ways that the superclass's instance variables could be initialized within the constructor for the extended class.
In Java programming. Write the code to create an object of each type of class. The names of the objects created in this part will be used for further requirements in this phase. Class Name: Customer Class Name: Inventory Class Name: OrderHeader Class Name: OrderDetail Class Name: Invoice Class Name: Shipment Four lines of code, one for each class defined above.
If class A is a subclass of class B, then A has access to all of B's instance variables, including private ones. True False
Suppose we have an program which is a Human Resources system used to hire and track new employees. One class in the program is the Employee class. Other classes include Payroll, Supplies, Vendors and Trainers. Consider just the Employee class itself. Which of the following data fields and methods would be appropriate to include in the Employee class and any classes extended from Employee? Hint: Think about object oriented design principles, and locating data fields and methods in classes to which they directly belong and associate to. O first name O hire date O Office Address O Company Lax ID O Supplier tax ID O Vendor Invoices O birth date O employe ID number
Java Program This assignment requires one project with two classes. Class Employee Class Employee- I will attach the code for this: //Import the required packages. import java.text.DecimalFormat; import java.text.NumberFormat; //Define the employee class. class Employee { //Define the data members. private String id, lastName, firstName; private int salary; //Create the constructor. public Employee(String id, String lastName, String firstName, int salary) { this.id = id; this.lastName = lastName; this.firstName = firstName; this.salary = salary; } //Define the getter methods. public String getId() { return id; } public String getLastName() { return lastName; } public String getFirstName() { return firstName; } public int getSalary() { return salary; } //Define the method to return the employee details. @Override public String toString() { //Use number format and decimal format //to…
Exercise 4: Create class Author with following instance variable and methods. Instance variables: name (String), email (String), and gender (char of either 'm' or 'f); Constructor: Author (String name, String email, char gender) Methods: getName(0), getEmail(), setEmail(), getGender(), toString(). Then create class called Book is designed to model a book written by one author. It contains: Four private instance variables: name (String), author (of the class Author you have just created, assume that a book has one and only one author), price (double), and qty(int); Two constructors: Public Book(String name, Author author, double price) Public Book(String name, Author author, double price, int qty) public methods getName(), getAuthor(), getPrice(), setPrice(), getQty), setQty(), toString() Write the Book class (which uses the Author class written earlier). Also write a test driver called TestBook to test all the public methods in the class Book. Take Note that you have to construct an…
. Given the following classes, answer the question. Director (extend the class Person) that has the following: Data Fields: private double salary. Constructor: Constructor to create a Director object with specified name, address, and salary. Methods: Accessor and mutator methods for salary data field. Design UML diagram for the above classes. Write the code only for class Person and Class Student.
The class object is added to the class object. When a state change is recognized, the method in the interface is called. The ConcreteObserver the Observer interface.
Java Program This assignment requires one project with two classes. Class Employee Class Employee- I will attach the code for this: //Import the required packages. import java.text.DecimalFormat; import java.text.NumberFormat; //Define the employee class. class Employee { //Define the data members. private String id, lastName, firstName; private int salary; //Create the constructor. public Employee(String id, String lastName, String firstName, int salary) { this.id = id; this.lastName = lastName; this.firstName = firstName; this.salary = salary; } //Define the getter methods. public String getId() { return id; } public String getLastName() { return lastName; } public String getFirstName() { return firstName; } public int getSalary() { return salary; } //Define the method to return the employee details. @Override public String toString() { //Use number format and decimal format //to…
Explain........... A method defined within a class and whose header does NOT include the static modifier is known as which of the following? a class method b instance method c super method d private method e public method

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What is the scope of a private instance variable? O All classes in the same package as the class in which the variable is defined. O Only the method in which the variable is defined. The entire class in which the variable is defined. The entire program.