What will be the output of the following program?abstract class A{abstract void firstMethod();void secondMethod() {System.out.print("SECOND ");firstMethod();abstract class B extends A{void firstMethod() {System.out.print("FIRST ");thirdMethod(0;abstract void thirdMethod();class C extends B {void thirdMethod(){ System.out.print("THIRD "); }}public class MainClass {public static void main(String[] args) {C c= new CO;c.firstMethod();c.secondMethod();c.thirdMethod();

What will be the output of the following program? abstract class A{ abstract void firstMethod(); void secondMethod() { System.out.print("SECOND "); firstMethod(); abstract class B extends A{ void firstMethod() { System.out.print("FIRST "); thirdMethod(); abstract void thirdMethod(); class C extends B { void thirdMethod(){ System.out.print("THIRD "); } } public class MainClass { public static void main(String[] args) { Cc = new C(); c.firstMethod(); c.secondMethod(); c.thirdMethod();

What will be the output of the following program? abstract class A{ abstract void firstMethod(); void secondMethod() { System.out.print("SECOND "); firstMethod(); abstract class B extends A{ void firstMethod() { System.out.print("FIRST "); thirdMethod(); abstract void thirdMethod(); class C extends B { void thirdMethod(){ System.out.print("THIRD "); } } public class MainClass { public static void main(String[] args) { Cc = new C(); c.firstMethod(); c.secondMethod(); c.thirdMethod();

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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Java language pls write a main program of the language class given below and make sure that your output matches with the one given below. Language.java public final class Language { // // Static Data Fields // private static final String defaultAlienSound = "~ ąļīæń ~ "; // Default // // Instance Data Fields // // // Constructors // public Language() { } public Language(String language) { switch (language.toLowerCase()) { case "alien" -> this.populateAlienPhrases(); // Supported case "chinese" -> this.populateChinesePhrases(); // Future implementation case "french" -> this.populateFrenchPhrases(); // Future implementation case "spanish" -> this.populateSpanishPhrases(); // Future implementation case "future" -> this.populateYourLanguagePhrases(); // Future implementation default -> this.populateEnglishPhrases();…
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
[CLO-4] Consider the following classes: package p1; public class Child extends Parent{ private int a; package p1; public Child(){ public class Parent{ System.out.println("In Child"); } private int x; public int y; public Child(int a){ protected int z; int w; this.a = a; System.out.print("In Child with parameter"); } public Parent() { System.out.println("In Parent"); public void print() { } // 1 public void print() { System.out.print(a); // 2 System.out.print(x + +y); } System.out.print(x); // 3 }// end class System.out.print(z); // 4 System.out.print(w); JULL IU 11 12 13 14 In the method print() of the child class. Which statement is illegal ?? O // 2 System.out.print (x); // 2 System.out.print (x); // 4 System.out.print (w); // 2 System.out.print (x); // 3 System.out.print (z); // 4 System.out.print (w); // 2 System.out.print (x); // 3 System.out.print (z); O All statements are illegal. // 1 System.out.print (a); // 2 System.out.print (x); O O ال-ال- } }// end class CamScanner
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.
Consider the following class: class Complex { double x, y; public: Complex(double newX, double newY) { x = newX; y = newY; Complex operator+(const Complex& c) { Complex temp; temp.x = this->x + c.x; temp.y = this->y + C.y; return temp; } friend ostream& operator<< (ostream& out, const Complex& c) { out << c.x << " + " << c.y << '"i"; return out; } }; Let the following objects be defined: Complex a(1, 2); Complex b(3, 4); Complex c = a + b; What is the output of the statements below?
Given the following definitions: public abstract class Manager extends Employee {...} public class Executive extends Manager { ... } What, if anything, is wrong with the following code? public class hrSystem { } public void payRaise () { } Manager m = new Manager(); O Compiler error because there is no Manager constructor. Compiler error because Manager is abstract so an instance cannot be created. No problem. The code will compile without any errors. O Compiles fine but will generate a run-time error unless an Employee object is created first.
In what kind of situation would you want to use an abstract class instead of a base class?
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