Write a class called person, which contains: A private class variable, Counter, initialized with zero and counts the number of person objects. Note that the variable is increased by one in the constructor while it is decreased by one in the destructor. A constructor with two parameters to define and initialize the instant/object variables/attributes, name and phone, of type string. ● Method updatephone to update the phone variable. getPerson Count method to return Counter the number of person objects ● ●

Write a class called person, which contains: A private class variable, Counter, initialized with zero and counts the number of person objects. Note that the variable is increased by one in the constructor while it is decreased by one in the destructor. A constructor with two parameters to define and initialize the instant/object variables/attributes, name and phone, of type string. ● Method updatephone to update the phone variable. getPerson Count method to return Counter the number of person objects ● ●

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

Java:
Program this
Create a object called Teacher. Declare the following variables for the object: string f_name, string subject, int age and int room_no. Include in the object a default constructor and a parameterised constructor. The parameterised constructor has the following parameters (name and age). Create your main class Teaching. The reference variable for the default constructor is T1 and for the parameterised constructor is T2. Pass the following values for the T1 reference to the default constructor: f_name = John subject = Science age = 35 room_no = 10 Pass the following variable using the T2 reference to the parameterised constructor: name = Smith age = 45 Program must include System.out statements to display the output.
Object-oriented programmingcreate a program that manages the production of a company. The production of each of the months of the year 2021 is saved, the average production of the year is also stored.Include a method to display all company information.Include at least three public or private type attributes. If they are private don't forget to include the getter and setter methods ONLY for private attributes.Include both default and parameterized constructors.Your program must allowShow all company dataRequest company dataShow the name of the month that had the highest production.Show the name of all the months with production less than the annual average.Identify the methods that are of the class and those that are of the main program.DO NOT forget that attributes, methods, classes, objects and messages are written in English.The MIN and MAX methods must be part of the main program. NOT of the class
The Essay class has a default constructor, a constructor with two parameters, and a constructor with three parameters. Declare the following objects: essay1 with no arguments essay2 with essayTitle and essayAuthor as arguments essay3 with essayTitle, essayAuthor, and essayYear as arguments Ex: If the input is Painting Cole 1919, then the output is: Essay: Undefined, Unspecified, 0 Essay: Painting, Cole, 0 Essay: Painting, Cole, 1919 Archive.java public class Archive { publicstaticvoidmain(String[] args) { Scannerscnr=newScanner(System.in); StringessayTitle; StringessayAuthor; intessayYear; essayTitle=scnr.next(); essayAuthor=scnr.next(); essayYear=scnr.nextInt(); /* Your code goes here */ essay1.print(); essay2.print(); essay3.print(); } } Essay.java public class Essay { private String title; private String author; private int year; public Essay() { // Default constructor title = "Undefined"; author = "Unspecified"; year = 0; }…
1. Create a properly encapsulated class named Person that has the following: A String instance variable called name. A constructor that takes a String parameter and sets the instance variable. A properly named getter for the instance variable. A correctly overrided equals method which returns true if the name instance variable of the parameter and the reference variable calling the method are equal. (Do not forget the null and class type checks!) Compile your Person class. 2. Create a properly encapsulated class named Employee that inherits from Person and has the following: ● ● ● A String instance variable called office (e.g. "LWH 2222"). A String instance variable called hourlywage (e.g. "$45.15"). A constructor that takes three Strings as parameters for name, office, and hourlyWage and sets the instance variables of both the parent class and the Employee class. An overridden toString method that returns the concatenation of name and hourlyWage instance variables (separated by a…
A. Build a class named car. This class is defined as follows: It has the fields: Car ID, Car model, Car make, Car color, Car year. Build a constructor that accepts the five parameters (Car ID, Car model, Car make, Car color, Car year). Override the method toString() to return the string representation of Car ID, Car model, Car make, Car color, Car year. Build a method named display to print the values returned by toString() method. Override the equals() method to compare the Car model, Car make, Car color of two Car objects. The method returns true if all the values of these fields are the same, and false otherwise. In the equals method you must check the following: a. If you compare the Car object to itself, return true.! b. If you compare car object with another car object return true, otherwise return false. Hint use : instanceof operator for this purpose. Override the hashcode() method to return same hash codes for objects that are equal according to the equals() method you built…
- Creates a class Teacher with two attributes: name and specialty. a. Add a constructor able to create a Teacher; b. Add the methods getName and getSpeciality; c. Add the method display able to display the attributes
1. Create a class called Elevator that can be moved between floors in an N-storey building. Elevator uses a constructor to initialize the number of floors (N) in the building when the object is instantiated. Elevator also has a default constructor that creates a five- (5) storey building. The Elevator class has a termination condition that requires the elevator to be moved to the main (i.e., first) floor when the object is cleaned up. Write a finalize() method that satisfies this termination condition and verifies the condition by printing a message to the output, Elevator ending: elevator returned to the first floor. In main(), test at least five (5) possible scenarios that can occur when Elevator is used in a building with many floors (e.g., create, move from one floor to another, etc.). Hint: Termination occurs when the instance is set to null. You may wish to investigate “garbage collection” for this exercise.
Overriding is useful when a method has the same signature and type as a method in the parent class. O a local variable has the same name as an instance variable. O you want to change the return type of a method. O a method has the same signature as another method in the same class.
The class contains one constructor: public Account (double initBal, String owner, long number) which initializes the instance variables. 1. Overload the constructor as follows: public Account (double initBal, String owner) - initializes the balance and owner as specified; randomly generates the account number. public Account (String owner) - initializes the owner as specified; sets the initial balance to 0 and randomly generates the account number. public Account () - initializes the owner with empty string name; sets the initial balance to 0 and randomly generates the account number. 2. Overload the withdraw method that also takes a fee parameter and deducts that fee from the account. 3. Write a driver program that invokes all four versions of the constructors and two versions of the withdraw methods. Think about how the compiler can tell which method is invoked. Code: //*******************************************************// Account.java//// A bank account class…