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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Similar questions

Modify and rewrite the Food class to an abstract class, so that no instance of Food class can be created
State a circumstance in which you would prefer an interface over an abstract class. Also, State a circumstance in which you would prefer an abstract class over an interface.
Q2
When should one use an abstract class, when should one use an interface, and when should one use both?
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.
B2
What does an abstract class serve?