Given: class SuperClass { SuperClass(int x) { System.out.println("Super"); } } public class SubClass extends SuperClass { SubClass() { // Line n1 System.out.println("Sub 2"); Which statement, when inserted at Line n1, enables the code to compile? SuperClass(10); super.SuperClass (10); this(10); super(10);

Given: class SuperClass { SuperClass(int x) { System.out.println("Super"); } } public class SubClass extends SuperClass { SubClass() { // Line n1 System.out.println("Sub 2"); Which statement, when inserted at Line n1, enables the code to compile? SuperClass(10); super.SuperClass (10); this(10); super(10);

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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Similar questions

1) Draw a class diagram depicting the below code. class Doctor { void Doctor Details () { System.out.println("Doctor Details..."); } class Surgeon extends Doctor { void Surgeon_Details () { System.out.println("Surgen Detail..."); } } public class Hospital { public static void main(String args[]) { Surgeon s = new Surgeon (); } } } 2) Establish an association between Person class and Book Class given below. public class Person { } s. Doctor Details (); s. Surgeon Details (); } private String name; private int age; public Person (String initialName) { this.name = initialName; this.age = 0; } public void printPerson() { } public String getName() { return this.name; } System.out.println(this.name + age public class Book { private String name; private String publisher; private ArrayList authors; // constructor public ArrayList getAuthors() { return this.authors; } public void addAuthor (Person author) { this.authors.add(author); } + this.age + 11 years");
In a subclass, may the overridden method's scope be altered?
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).
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.
6. Given: class Pet { public: virtual void eat() { cout eat(); } What is the result of compiling and running the above program? m. The program compiles and crashes when it runs. i. The program compiles and runs, printing "Pet::eat" j. The program compiles and runs, printing "Cat::eat" The program compiles and runs to completion without printing anything. n. o. None of the above. k. The program fails to compile because the method eat is not marked virtual in Cat. I. The program fails to compile for some other reason.
Modify and rewrite the Food class to an abstract class, so that no instance of Food class can be created
what does the following print 1 #include 2class CreateDestroy 3 { 'public: CreateDestroy() { ~CreateDestroy() { cout << "destructor called, "; } } ; { cout << "constructor called, "; } •main() 10 { for (int i=0;i<3;i++) CreateDestroy cl; CreateDestroy c2; 11 12 13 14 15
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 */ } };
Find the error in the following code segment: 1 2 |/ Superclass 3 public abstract class Vehicle 4- { public abstract double getKMPerlitre(); 7 (Other methods . . .) 8 } 10 11 12 // Subclass 13 public class Car extends Vehicle 14- { 15 private int distance; 16 public int getKMPerlitre() { return distance; } 17 18- 19 20 21 22 (Other methods .) 23 } 24 a. public abstract double getKMPerLitre(); should not end with a semicolon. O b. The getKMPerLitre method in the Car class should return a double. O c. The Car class cannot extend Vehicle class. O d. The Vehicle class should not be abstract.