Given:abstract class A{{ }A() { }static int a;void methodA(){ }}cannot have anonymous instance initializer blockcannot have a constructorcannot have static variablesO everything is okay class A{void methodA(){}void methodB();}class B extends A{void methodA(){ }}class A should be abstractmethodB should be abstractboth a and bboth classes are okay

1. The correct option is- everything is okay Explanation: The given code is: abstract class A{ {}…

Answered: class Al void methodA(){ } void…

class Al void methodA(){ } void methodB(); } class B extends A{ void methodA(){ } } O class A should be abstract methodB should be abstract O both a and b both classes are okay

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

Related questions

Q: Parent Class: Food Write a parent class called Food. A food is described by a name, the number of…

A: 1. Declare a public class named "Food".2. Define private instance data variables: name (String),…

Q: Find the error in each of the following code segments: // Superclasspublic class Vehicle{private…

A: Given : Find the error in each of the following code segments: // Superclasspublic class…

Q: I public class Secret Identity { private String realName; private String occupation; private String…

A: Here is the code with Accessors, Mutators and toString methods:

Q: Code: interface Bicycle{ //interface for bicycle void changeGear(int val); //abstract…

A: Solution is given below-

Q: Given: abstract class A{ int a; int b; } class B extends A{ int a; } O cannot make class A abstract…

A: Answer 1: A- cannot make class A abstract Abstract classes can not be instantiated.

Q: Default constructors are inherited from the base class, thereby eliminating the need for derived…

A: The answer is "False".

Q: class A {protected int x1,1,2; public: A(a, b,c):x1(a+2),y1(b-1),z(c+2) { for(i=0; i<5;i++)…

A: Explanation: Consider the given code. The values of k, m, and n are 4, 2, and 5 respectively. The…

Q: When a subclass method has the same name, parameter list and return type as a method in the parent…

A: according to our guidelines we can answer only one question if you want answer of another question…

Q: /** Represents a car. */ public class Car // TODO: Inherit from Vehicle { // Do NOT add any…

A: Description: In the constructor of Car class, call the superclass constructor with the purchasePrice…

Q: Determine if this statement is true or false Take the following method, which is defined in some…

A: Hi.. You can check your answer below

Q: Add a constructor to the same class that initializes the same object's state with those values. 20.…

A: The keyword "this" is a fundamental concept in computer science, particularly in object-oriented…

Q: The following class declaration has errors. Locate as many as you can. class Point {private: int…

Q: public class FoodItem { private String name; private double fat; private double carbs;…

A: 1public class FoodItem { 2 private String name; 3 private double fat; 4 private double carbs;…

Q: have the same (x, y) Section 8.4: Encapsulation 22. What is abstraction? How do objects provide…

A: NOTE: The class Point is not given. So, the class Point is created before adding methods setX and…

Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

Given:
abstract class A{
{ }
A() { }
static int a;
void methodA(){ }
}
cannot have anonymous instance initializer block
cannot have a constructor
cannot have static variables
O everything is okay

class A{
void methodA(){}
void methodB();
}
class B extends A{
void methodA(){ }
}
class A should be abstract
methodB should be abstract
both a and b
both classes are okay

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.

Similar questions

oop answer in essay form
QUESTION 2 A protected member of a class may be directly accessed by methods of the same class methods of a subclass methods in the same package Any of these QUESTION 3 A subclass can directly access only public and private members of the superclass all members of the superclass only protected and private members of the superclass only public and protected members of the superclass
Defining Classes Write and document the definition for the Money class. The Money class represents an amount in U.S. dollars. Money Class e Fields cents : int dollars : int e Methods getValue() : double Money(int d, int c) setCents(int c) : void setDollars(int d) : void toString() : String • Each Money object has two int instance variables: dollars and cents. • The class has one constructor that takes two int parameters. The first int represents whole dollars, and the second int represents cents. • The class has one accessor method named getValue() which returns the amount as a double. (Just divide cents by 100.0 and add it to dollars. Return that amount.) • The class has two mutator methods-setDollars() and setCents()–that modify the corresponding instance variables. • The class has a toString() method that returns the amount as a String in the form: $ 2345.75. Use concatenation to produce the output. Do not worry about the decimal places.
Fill in the empty boxes in the pictures below from the choices.
use the following partial class definitions:public class A1{public int x;private int y;public int z;…}public class A2 extends A1{public int a;private int b; …}public class A3 extends A2{private int q;…} 4) Which of the following is true regarding the use of instance data y of class A1?a) it is accessible in A1, A2 and A3b) it is accessible in A1 and A2c) it is accessible only in A1d) it is accessible only in A3e) it is not accessible to any of the three classes
// Defines a base class named Customer // And a child class FrequentCustomer who receives a discount // Main program demonstrates a customer of each type using System; public class DebugTen01 { public static void Main() { Customer aRegularCustomer = new Customer(); FrequentCustomer aFrequentCustomer = new FrequentCustomer(); aRegularCustomer.CustNum = 2514; aRegularCustomer.CustBalance = 765.00; aFrequentCustomer.CustNum = 5719; aFrequentCustomer.CustBalance = 2500.00; aFrequentCustomer.DiscountRate = 0.15; WriteLine("\naRegularCustomer #{0} owes {1}",aRegularCustomer.CustNum,aRegularCustomer.CustBalance.ToString("C2")); WriteLine("\naFrequentCustomer #{0} would owe {1} without the discount",aFrequentCustomer.CustNum,aFrequentCustomer.CustBalance.ToString("C2")); double newBalance = (1 - aFrequentCustomer.DiscountRate) * aFrequentCustomer.CustBalance; WriteLine("...with {0} discount,…
Complete the partial declaration of Class Car: public class Car { // declare three private instance variables: color, speed, model // define a constructor with two parameters: c , m which will assign values to color and model. //define set and get method for all instance variables //define a method named calspeed( ) with int return type, the method will increase the speed by 50 mile per hour. } Complete the application below. public class CarApp { public static void main() { string color = blue; string model = C2021;i int speed = 80; // declare necessary object matching to the constructor definition // display the color and model on the screen // call the calspeed( ) method and display the new speed after calculation. } }
Given: interface B void methodA(); class C implements B { void methodB(){ } } everything is fine methodA should be overriden in class C O class C should be abstract O either b or c
Given the following code for a class named Employee, complete the following constructor public class Employee ( private int employeeID; private int SSN; public Emplyee(int employeeID, int SSN) {
An object can be created from an abstract class is it true or false
If a class is derived from a base class that has an abstract method, what must the derived class do?
15. Suppose the class Employee is declared as follows: public class Employee { private String name; private double baseSalary: public void setName(String newName) {...} public void setBasSalary(double newSalary){...} public String getName() {...} public double getSalary({...} } a)Declare a class Manager that inherits from the class Employee and adds an instance variable bonus for storing a salary bonus. Omit constructors and methods. ANS: b) Which instance variables does the Manager class have? c) In the manager class, provide the method overrides the getSalary method from the class Employee so that it returns the sum of the salary and the bonus d) Based on the above question, which methods does the manager class inherit? e) In the manager class, override the getName method so that managers have a before their name (such as *John Smith).