a String expression to represent an object's state. a. toString () b. abstract c. super () d. this () 11. The call in a class constructor invokes the superclass's constructor that has the corresponding argument list. a. tostring () b. abstract c. super () d. this() 12. The call to invokes the constructor for the current class whose parameter list matches the argument list. a. tostring () b. abstract c. super () d. this () 13. If no constructors are defined for a class, the constructor for that class will be provided by default. a. private b. super c. public d. no-argument 14. What is a keyword to declare a subclass to a super class in Java? a. implements b. extends c. throws d. follows

a String expression to represent an object's state. a. toString () b. abstract c. super () d. this () 11. The call in a class constructor invokes the superclass's constructor that has the corresponding argument list. a. tostring () b. abstract c. super () d. this() 12. The call to invokes the constructor for the current class whose parameter list matches the argument list. a. tostring () b. abstract c. super () d. this () 13. If no constructors are defined for a class, the constructor for that class will be provided by default. a. private b. super c. public d. no-argument 14. What is a keyword to declare a subclass to a super class in Java? a. implements b. extends c. throws d. follows

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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True or false?(a) Every object is an instance of the object class.(b) If a class does not extend a superclass explicitly, it extends object by default.
Please code in python Create a program with two classes – the person class and the student The person class has the following properties: first name (first_name), last name (last_name) street address (address) city (city) zip code (zip) The class has the following methods: get_full_name, which returns the full name of a person get_full_address, which return greeting, returns a greeting message. The class should provide accessor and mutator for each property The class should override the __str__ method to return the state of the object. Create a child class called student which has a property named graduation year (graduation_year) and major. Provide accessor and mutator for each property of its own It inherits all the properties and methods of the person parent class as well. Create a test program that Create an object of the person class and print the full name of a person. Create an object of the person class and print…
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…
Inheritance is an OOP concept such that a class can be defined in different ways, such as either being typecasted to itself (as a subclass) or any of its superclasses. True False
The non-static class level variables and non-static methods of a class are known as a. instance members b. object behaviors c. object attributes O d. object references
Create an Employee Class with the ff: attributes: = String name = double salary = String birthday = __init__(self, name, salary, birthday) = String getDetails() -- returns a String value that represents all the information of the Employee object Create a Manager class that inherits Employee, a Manager will also have the ff: = String department = __init__(self, name, salary, birthday, department) = String getDetails() -- returns a String value that represents all the information of the Manager object Create a Director class that inherits Manager, a Director will also have the ff: = double carAllowance = __init__(self, name, salary, birthday, department, carAllowance) = def playGolf() -- will print a string value '{name of director} plays golf' = String getDetails() -- returns a String value that represents all the information of the Director object Create 2 objects of each class and call their respective getDetails() method. Do not write WET codes, be sure there's no…
Given the following super class and subclasses: public abstract class ThemePark String name: // customer's name String icNo: // customer's identification card number boolean member: // either member or nonmember of the // theme park //Methods: //default and normal constructor //accessors //toString0 public abstract double calCharges0: //calculate the charges public class WaterPark extends ThemePark String activity: // surfBeach,waterRide or other //Methods: //default and normal constructor //accessors /toString0 public double calCharges) . public class WildlifePark extends ThemePark String category: //child or adult I/Methods: //default and normal constructor //accessors /toString) public double calCharges) .) b) Write code fragments in the application / driver class that can perform the following tasks: (Assume all relevant methods have been defined in all classes involved) ii) Assuming data has been stored in this tp array, calculate and display the total charges of every WaterPark…
1. Create a class RealEstate with the following details: Member variables: buildingID // building ID string type buildingName // name of the building string type Member Methods: · Parameterized constructor to set the member variables. · rentPrice(): An abstract method which calculates and return the rent. Defined in a subclass. · display(): To display the name & ID of the building. 2. Create a class Apartment that inherits RealEstate with the following details: Member variables: · noOfrooms // number of rooms int type · noOfBathroom // number of bath rooms int type · furnished // To check whether the furnished or not Boolean type Member Methods: · Define the parameterized constructor to set the member variables and also call the constructor of the superclass · Define the method rentPrice() which calculate and return the rent as given below:…
If a member is declared private in a class, can it be accessed from other classes? If a member is declared protected in a class, can it be accessed from other classes? If a member is declared public in a class, can it be accessed from other classes?
7. When a class contains objects of another class, the relationship is called a whole-part relationship or composition. The relationship created is also called a has-a relationship. Discuss some of the possible issues with composition, such as the long statement: Outputsales.getHighestPaidEmployee().getHireDate().getYear().
1. Design a new Triangle class that extends the abstract GeometricObject 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.
Design a Ship class that has the following members:• A field for the name of the ship (a string).• A field for the year that the ship was built (a string).• A constructor and appropriate accessors and mutators.• A toString method that displays the ship's name and the year it was built.Disign a CruiseShip class that extends the Ship class. The CruiseShip class should have thefollowing members:• A field for the maximum number of passengers (an int).• A constructor and appropriate accessors and mutators.• A toString method that overrides the toString method in the base class. The CruiseShipclass's toString method should display only the ship's name and the maximum number ofpassengers.Design a CargoShip class that extends the Ship class. The CargoShip class should have thefollowing members:• A field for the cargo capacity in tonnage (an int).• A constructor and appropriate accessors and mutators.• A toString method that overrides the toString method in the base class. The CargoShipclass's…