Consider: interface I { } interface J { } } void doI(); class A implements I { } 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() { } } I i1= new B(); I i2= new D(); J j1 = new C(); Jj2 = new D(); Which of the following are valid?

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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Partial
Question 5
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()
}
I i1= new B();
I i2= new DO);
J j1 = new C();
J j2= new D();
Which of the following are valid?
il.doI();
j2.doI();
i2.doJ();
j1.doI();
j2.doJ();
j1.doJ();
il.doJ()
i2.doI();
Transcribed Image Text:Partial Question 5 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() } I i1= new B(); I i2= new DO); J j1 = new C(); J j2= new D(); Which of the following are valid? il.doI(); j2.doI(); i2.doJ(); j1.doI(); j2.doJ(); j1.doJ(); il.doJ() i2.doI();
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