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

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.
When a concrete class inherits from an abstract class, you have to implement all abstract methods declared in the super class before you can instantiate it (the concrete class). True False
Inheritance is an OOP concept such that a class can be defined in different ways, such as either being typecasted to itself (as a subclass) or any of its superclasses. True False
True or False A subclass can override methods from its superclass.
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.
class implementation file -- Rectangle.cpp class Rectangle { #include #include "Rectangle.h" using namespace std; private: double width; double length; public: void setWidth (double); void setLength (double) ; double getWidth() const; double getLength() const; double getArea () const; } ; // set the width of the rectangle void Rectangle::setWidth (double w) { width = w; } // set the length of the rectangle void Rectangle::setLength (double l) { length l; //get the width of the rectangle double Rectangle::getWidth() const { return width; // more member functions here
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; }
public class Cat extends Pet { private String breed; public void setBreed(String userBreed) { breed = userBreed; } public String getBreed() { return breed; }} public class Pet { protected String name; protected int age; public void setName(String userName) { name = userName; } public String getName() { return name; } public void setAge(int userAge) { age = userAge; } public int getAge() { return age; } public void printInfo() { System.out.println("Pet Information: "); System.out.println(" Name: " + name); System.out.println(" Age: " + age); } } import java.util.Scanner; public class PetInformation { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); // create a generic Pet and a Cat Pet myPet = new Pet(); Cat myCat = new Cat(); // declare variables for pet and cat info String petName, catName, catBreed; int petAge,…
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.
Base class A Base class B Private : int B_value; Private : int B_value; Protected: Protected: Public: Public: void A_input() void A get() void B_input() void B_ get() Driver Class C: public A, public B C is a derived class from classes A and B Private: int D_value; Protected: Public: void difference() void A_get() void B_ get () void A input () void B get () // Enter the integer value of class A // Return value of int B_value void A get () void difference() // Return value of int A_value IlCcalculate the difference between the two value (D = A_value - B_value) void B input ( // Enter the integer value of class B
Design/code/test a Java program containing an abstract the class absWelcome. This class should contain: 1. A public abstract void method (you name it) that is empty 2. A public regular method (you name it) that prints "Welcome to " Next, create a subclass clsHello that extends absWelcome. This class should contain: • A public regular method (you name it) that prints "Java Programming" Finally, inside the Main class create an object (you name it) from the clsHello class. Use this new object reference to: 1. Output "Welcome to " from the abstract class 2. Output "Java Programming" from the subclass Your output should resemble that shown below >sh -c javac -classpath -type f-name '*.java') java -classpath :targe Welcome to Java Programming