Givenclass x{static int a;int b;void m10{ }static void m2(){ }}class Ab extends x{static int a;int b;void m10{ }static void m2(){ }public static void main (String[] args){ }}which one is not valid inside of the main methodO x obj = new x();O x obj = new Ab();O Ab obj = new x();O Ab obj = new Ab(); Givenclass x{static int a;int b=12;void m1(0{ }static void m2({ }class Ab extends x{static int a;int b=10;void m10{ }static void m20{ }public static void main (String[] args){int b=3;x obj=new Ab();}How can you get access to the "m1" method in the child classO cast obj before getting access to itO use obj.m1()O you cannot get access to the "m1" in the child classO use the super keywordO Either A or B

In this code class Ab inherits class x. The base class x can instantiate class Ab but Ab cannot do…

Answered: siven lass x{ static int a; int b; void…

Engineering

Computer Science

siven lass x{ static int a; int b; void m10{ } static void m2

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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Q-2) Given the following code: class Calculation { int z, public void addition(int x, int y) { z = x + y; System.out.println("The sum of the given numbers:"+z); } public void Subtraction(int x, int y) { z = x-y; System.out.println("The difference between the given numbers:"+z); public class My_Calculation extends Calculation { public void multiplication(int x, int y) { z = x*y; System.out.println("The product of the given c) Give the output when this program is run: numbers:"+z); } public static void main(String args[]) { int a = 20, b = 10; } My Calculation demo = new My_Calculation(); demo.addition(a, b); demo.Subtraction(a, b); demo.multiplication(a, b); Complete the missing lines in a and b a) Name the superclass the subclass b) Suppose we wish to save the program in a text file My_Calculation. The extension should be d) Which objects (variables and methods) are inherited from the superclass? e) If you instantiate demo as Calculation demo = new My_Calculation(); in the main…