Incorrect Question 4 Consider: interface I { } interface J { } } class A implements I { void doI(); } void doJ(); class B extends A { } public void doI() { } } class C implements J { public void doJ() { } public void doJ() { } class D implements I, J { public void doI() { } public void doJ() { } Which of the following are valid? ✓ 0 0 I x = new D(); I x = new B(); J x = new DO); J x = new J(); B x = new B(); x.doI(); I x = new A(); J x = new A(); J x = new C(); A x= new A(); x.doI(); I x = new C(); J x = new B(); A x= new A(); x.doJ(); I x = new I()); B x= new B(); x.doJ();

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
icon
Related questions
Question
Incorrect
Question 4
Consider:
interface I
{
}
interface J
{
}
}
class A implements I
{
void doI();
}
void doJ();
class B extends A
{
}
public void doI()
{
}
}
public void doJ()
class C implements J
{
}
public void doJ()
{
}
class D implements I, J
{
public void doI()
}
public void doJ()
}
Which of the following are valid?
✓
0
0
10
I x = new DO);
I x = new B();
J x = new D();
J x = new J();
B x= new B();
x.doI();
I x = new A());
Jx= new A();
J x = new C();
A x= new A();
x.doI();
I x = new CO;
J x = new B();
A x = new A();
x.doJ();
I x = new IO;
B x= new B();
x.doJ();
Transcribed Image Text:Incorrect Question 4 Consider: interface I { } interface J { } } class A implements I { void doI(); } void doJ(); class B extends A { } public void doI() { } } public void doJ() class C implements J { } public void doJ() { } class D implements I, J { public void doI() } public void doJ() } Which of the following are valid? ✓ 0 0 10 I x = new DO); I x = new B(); J x = new D(); J x = new J(); B x= new B(); x.doI(); I x = new A()); Jx= new A(); J x = new C(); A x= new A(); x.doI(); I x = new CO; J x = new B(); A x = new A(); x.doJ(); I x = new IO; B x= new B(); x.doJ();
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

Blurred answer
Knowledge Booster
Introduction to Interface
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education