PartialQuestion 5Consider: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();

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?

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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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();
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