Partial Question 3 Consider: class A { } public void doA() { } class B extends A { } public void doB () { } Which of the following are allowed? B x = new B(); x.doB(); A x = new A(); x.doA(); A x = new A(); x.doB(); B x = new B(); x.doA();
Partial Question 3 Consider: class A { } public void doA() { } class B extends A { } public void doB () { } Which of the following are allowed? B x = new B(); x.doB(); A x = new A(); x.doA(); A x = new A(); x.doB(); B x = new B(); x.doA();
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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OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
Question
![Partial
Question 3
Consider:
class A
{
}
public void doA()
{
}
class B extends A
{
}
public void doB ()
{
}
Which of the following are allowed?
B x = new B();
x.doB();
A x = new A();
x.doA();
A x = new A();
x.doB();
B x = new B();
x.doA();](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F829812ca-fcc6-4eb6-9db8-017261f61931%2Fd5d54ac5-e1ba-4a4b-ac54-e6970dc230a9%2F5lq98wo_processed.png&w=3840&q=75)
Transcribed Image Text:Partial
Question 3
Consider:
class A
{
}
public void doA()
{
}
class B extends A
{
}
public void doB ()
{
}
Which of the following are allowed?
B x = new B();
x.doB();
A x = new A();
x.doA();
A x = new A();
x.doB();
B x = new B();
x.doA();
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