Question 18 What is output? public abstract class People { protected String name; protected int age; public abstract void PrintInfo(); public void PrintInformation() { System.out.println("In Base Class People"); } } public class Teacher extends People { private int experience; public void PrintInfo() { System.out.println("In Child Class Teacher"); } } public class Principal extends Teacher { public void PrintInformation() { System.out.println("In Child Class Principal"); } public static void main(String args[]) { Principal tim; tim = new Principal(); tim.PrintInfo(); } } Error: Compiler error In Base Class People O In Child Class Teacher O In Child Class Principal

Question 18 What is output? public abstract class People { protected String name; protected int age; public abstract void PrintInfo(); public void PrintInformation() { System.out.println("In Base Class People"); } } public class Teacher extends People { private int experience; public void PrintInfo() { System.out.println("In Child Class Teacher"); } } public class Principal extends Teacher { public void PrintInformation() { System.out.println("In Child Class Principal"); } public static void main(String args[]) { Principal tim; tim = new Principal(); tim.PrintInfo(); } } Error: Compiler error In Base Class People O In Child Class Teacher O In Child Class Principal

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

True or False A subclass can override methods from its superclass.
True or False A child class cannot override the parent’s definition of an inherited method.
What is the output of the following code? Convert the abstract class into an interface and modify the codes in all classes that will maintain the same output. (Rewrite the code)
Object oriented program
class smart { public: void print() const; void set(int, int); int sum(); smart(); smart(int, int); private: int x; int y; int secret(); }; class superSmart: public smart { public: void print() const; void set(int, int, int); int manipulate(); superSmart(); superSmart(int, int, int); private: int z; }; Now answer the following questions: a. Which private members, if any, of smart are public members of superSmart? b. Which members, functions, and/or data of the class smart are directly accessible in class superSmart?
public class Car { private int modelYear; // TODO: Declare purchasePrice field (int) private int currentValue; public void setModelYear(int userYear){ modelYear = userYear; } public int getModelYear() { return modelYear; } // TODO: Define setPurchasePrice() method // TODO: Define getPurchasePrice() method public void calcCurrentValue(int currentYear) { double depreciationRate = 0.15; int carAge = currentYear - modelYear; // Car depreciation formula currentValue = (int) Math.round(purchasePrice * Math.pow((1 - depreciationRate), carAge)); } // TODO: Define printInfo() method to output modelYear, purchasePrice, and currentValue } import java.util.Scanner;import java.lang.Math; public class CarValue { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); Car myCar = new Car(); int userYear = scnr.nextInt(); int userPrice = scnr.nextInt(); int…
Find the error(s) in the following class definition: public class TestClass private int value1; private int value2; public void TestClass(int num1, int num2) { value1= num1; value2 = num2; }
class IndexItem { public: virtual int count() = 0; virtual void display()= 0; };class Book : public IndexItem { private: string title; string author; public: Book(string title, string author): title(title), author(author){} virtual int count(){ return 1; } virtual void display(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };class Category: public IndexItem { private: /* fill in the private member variables for the Category class below */ ? int count; public: Category(string name, string code): name(name), code(code){} /* Implement the count function below. Consider the use of the function as depicted in main() */ ? /* Implement the add function which fills the category with contents below. Consider the use of the function as depicted in main() */ ? virtualvoiddisplay(){ /* YOU DO NOT NEED TO IMPLEMENT THIS FUNCTION */ } };
Explain how abstract classes and methods work
public class Cylinder { public void smoothen() { } } } public abstract class Vessel implements Steerable { private Engine e; } System.out.println("Smoothening.."); public Engine getEngine() { return e; } public void setEngine (Engine e) { this.e = e; } public abstract void turnOn(); public class Engine { private Cylinder [] y; private int cyls = 1; static final int maxCylinders = 12; public void addCylinder (Cylinder y) { if (cyls
When to declare abstract class? Topic software engineering
public abstract class Shape { public Shape() { } public abstract double area() ; public String who() { return "Shape" ; } } public class Circle extends Shape { private int radius ; public Circle( int r ) { radius = r ; } @Override public double area() { return Math.PI * radius * radius ; } } public class Square extends Shape { private int _sideLength ; public Square( int sideLength ) { /* TODO question 45 */ } @Override public double area() { return _sideLength * _sideLength ; } } Implement the Square constructor, and make sure it throws an exception when the input parameter is not a valid length. The input parameter must be positive to be considered valid.