Consider: class A { } } public void doA() class B extends A { } } public void doB() } class C extends B { public void doc() { Which of the following are allowed? A x = new A(); x.doA(); C x = new C(); x.doA(); A x = new A(); x.doC(); C x = new C(); x.doC(); C x = new C(); x.doB(); A x = new A(); x.doB();
Consider: class A { } } public void doA() class B extends A { } } public void doB() } class C extends B { public void doc() { Which of the following are allowed? A x = new A(); x.doA(); C x = new C(); x.doA(); A x = new A(); x.doC(); C x = new C(); x.doC(); C x = new C(); x.doB(); A x = new A(); x.doB();
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
Related questions
Question
Transcribed Image Text:Incorrect
Question 2
Consider:
class A
{
}
class B extends A
{
}
public void doA()
{
}
}
public void doB()
}
class C extends B
{
public void doc()
{
}
Which of the following are allowed?
A x = new A();
x.doA();
C x = new C();
x.doA();
A x = new A();
x.doC();
C x = new C();
x.doC();
C x = new C();
x.doB();
A x = new A();
x.doB();
Expert Solution
Step 1
Consider the first option.
A x = new A();
x.doA();
Here, x is an object of class A. doA method is also a member function of class A. Therefore, x can access the doA method since it is an object of the same class.
Therefore, this is allowed.
Option 1 is correct.
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