class Animal{} class Dog extends Animal{} class Wolf extends Animal{} public class HelloWorld{ public static void main (String [] args) Animal a; Dog d = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; d = (Dog) a; //Line3 //Line4 w = (Wolf) a; //Line5

class Animal{} class Dog extends Animal{} class Wolf extends Animal{} public class HelloWorld{ public static void main (String [] args) Animal a; Dog d = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; d = (Dog) a; //Line3 //Line4 w = (Wolf) a; //Line5

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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Trace through the following program and show the output. Show your work for partial credit. public class Employee { private static int empID = 1111l; private String name , position; double salary; public Employee(String name) { empID ++; this.name 3 пате; } public Employee(Employee obj) { empID = obj.empĪD; пате %3D оbj.naте; position = obj.position; %3D public void empPosition(String empPosition) {position = empPosition;} public void empSalary(double empSalary) { salary = empSalary;} public String toString() { return name + " "+empID + " "+ position +" $"+salary; public void setName(String empName){ name = empName;} public static void main(String args[]) { Employee empOne = new Employee("James Smith"), empTwo; %3D empOne.empPosition("Senior Software Engineer"); етрOпе.етpSalary(1000); System.out.println(empOne); еmpTwo empTwo.empPosition("CEO"); System.out.println(empOne); System.out.println(empTwo); %3D етpОпе empOne ;
class class { public static void main(String args[]) { int a =5; int b =10; first: { second: { third: { if(a == b >>1) break second; } System.out.println(a); } System.out.println(b); } } } Give result for the code Java Try to do ASAP
public class LabProgram { public static void main(String args[]) { Course cis162 = new Course(); int beforeCount; String toDrop; // Example students for testing cis162.addStudent(new Student("Henry", "Nguyen", 3.5)); cis162.addStudent(new Student("Brenda", "Stern", 2.0)); cis162.addStudent(new Student("Lynda", "Robison", 3.2)); cis162.addStudent(new Student("Sonya", "King", 3.9)); toDrop = "Stern"; beforeCount = cis162.countStudents(); cis162.dropStudent(toDrop); System.out.println("Course size: " + beforeCount + " students"); System.out.println("Course size after drop: " + cis162.countStudents() + " students"); } } import java.text.DecimalFormat; // Class representing a student public class Student { private String first; // first name private String last; // last name private double gpa; // grade point average // Student class constructor public Student(String f, String l, double g) {…
Question 37 public static void main(String[] args) { Dog[] dogs = { new Dog(), new Dog()}; for(int i = 0; i >>"+decision()); } class Counter { private static int count; public static void inc() { count++;} public static int getCount() {return count;} } class Dog extends Counter{ public Dog(){} public void wo(){inc();} } class Cat extends Counter{ public Cat(){} public void me(){inc();} } The Correct answer: Nothing is output O 2 woofs and 5 mews O 2 woofs and 3 mews O 5 woofs and 5 mews O
class TenNums {private: int *p; public: TenNums() { p = new int[10]; for (int i = 0; i < 10; i++) p[i] = i; } void display() { for (int i = 0; i < 10; i++) cout << p[i] << " "; }};int main() { TenNums a; a.display(); TenNums b = a; b.display(); return 0;} Write a copy constructor for the above class TenNums. Make sure it performs deep copy. Group of answer choices TenNums(const TenNums& b) { p = b.p;} TenNums(const TenNums& b) { p = new int[10]; for (int i = 0; i < 10; i++) p[i] = b.p[i];} TenNums(const TenNums b) { p = new int[10]; for (int i = 0; i < 10; i++) p[i] = b.p[i];} TenNums(const TenNums b) { p = b.p;}
class TenNums {private: int *p; public: TenNums() { p = new int[10]; for (int i = 0; i < 10; i++) p[i] = i; } void display() { for (int i = 0; i < 10; i++) cout << p[i] << " "; }};int main() { TenNums a; a.display(); TenNums b = a; b.display(); return 0;} Continuing from Question 4, let's say I added the following overloaded operator method to the class. Which statement will invoke this method? TenNums TenNums::operator+(const TenNums& b) { TenNums o; for (int i = 0; i < 10; i++) o.p[i] = p[i] + b.p [i]; return o;} Group of answer choices TenNums a; TenNums b = a; TenNums c = a + b; TenNums c = a.add(b);
public class Driver { /** * @param args */ static Scanner keyboard = new Scanner(System.in); publicstaticvoid main(String[] args) { Mailbox[] mailboxes = new Mailbox[5]; Mailbox mailbox1 = new Mailbox("gmail"); Mailbox mailbox2 = new Mailbox("outlook"); Mailbox mailbox3 = new Mailbox("icloud"); mailboxes[0] = mailbox1; mailboxes[1] = mailbox2; mailboxes[2] = mailbox3; Email email1 = new Email(); email1.setDate(new Date(2022, 11, 5)); email1.setSubject("Exam2 guidelines "); Email email2 = new Email(new Date(2021, 3, 5), true, "Quiz3 in Ch7"); Email email3 = new Email(); email3.setDate(new Date(2020, 11, 3)); email3.setSubject("Late submission policy"); mailbox2.addEmail(email1); mailbox2.addEmail(email2); mailbox2.addEmail(email3); // System.out.println("Hello! What would you like to do "); intselection = displayMenu(); while (selection != 5) { // selection = displayMenu(); switch (selection) { case 1: System.out.print("Enter the client: "); String…
public class Main{ public static void main(String args[]) { Main m = new Main(); m.go(); } public void go() { Customer c = new Customer("Tom", "Smith"); Order o = new Order(c); o.addItem(new Item("Greeting Card", 1.50, 1)); o.addItem(new Item("Baseball Glove", 54.00, 1)); o.addItem(new Item("Notebook", 2.50, 3)); System.out.println(o); }}
public class Main { public static void main(String args[]) { static_out obj1 - new static_out(); static_out obj2 = new static_out(); int a - 2; obj1. add(a, a + 1); obj2.add(5, a); System.out.println(obj1.x + } 4 - 6 7 9 + obj2.y); 12 13 14 class static_out { static int x; static int y; void add(int a, int b) { x = a + b; y - x + b; 15 - 16 17 18 19 - 20 I 21 22 23 24 O 77.4 66.4 O 79 O 97 O12 mt un o70 0 0o 234 111 111 111 12 2222
In C++ class rectangleType { public:     void setLengthWidth(double x, double y); //Sets the length = x; width = y;     void print() const; //Output length and width     double area(); //Calculate and return the area of the rectangle (length*width)     double perimeter(); //Calculate and return the perimeter (length of outside boundary of the rectangle) private:     double length;     double width; }; Declare an instance of rectangleType.
In C++ class rectangleType { public:     void setLengthWidth(double x, double y); //Sets the length = x; width = y;     void print() const; //Output length and width     double area(); //Calculate and return the area of the rectangle (length*width)     double perimeter(); //Calculate and return the perimeter (length of outside boundary of the rectangle) private:     double length;     double width; }; Set the length of the rectangle to 24 and the width to 30.
In C++ class rectangleType { public:     void setLengthWidth(double x, double y); //Sets the length = x; width = y;     void print() const; //Output length and width     double area(); //Calculate and return the area of the rectangle (length*width)     double perimeter(); //Calculate and return the perimeter (length of outside boundary of the rectangle) private:     double length;     double width; }; Print out the area of the rectangle.