Inheritance - Discussion Page For Q.2833 | Java Programming Questions and Answers | Java Programming Free Online-Tests | LucentBlackBoard

Home > Java Programming > Inheritance > Questions and Answers

What is the output for the below code ?

public class C {
}
public class D extends C{
}
public class A {
public C getOBJ(){
System.out.println("class A - return C");
return new C();
}
}
public class B extends A{
public D getOBJ(){
System.out.println("class B - return D");
return new D();
}
}
public class Test {
public static void main(String... args) {
A a = new B();
a.getOBJ();
}
}

A.	class A - return C	B.	class B - return D
C.	Compilation fails	D.	Compilation succeed but no output

Answer and Explanation

Answer:class B - return D

Explanation:
From J2SE 5.0 onwards. return type in the overriding method can be same or subtype of the declared return type of the overridden (superclass) method.

Comment on this Question
Name:

LucentBlackBoard.com has the web's largest collection of over 15,000 aptitude questions and answers with detailed explanation which include subjects like Arithmetic Aptitude, Logical Reasoning, Verbal Ability, General Knowledge, Programming Skills and more!

Our online education portal provides a unique and standard learning experience for students. We enable the students to prepare for most of the entrance and competitive exams like MBA (MAT, GMAT), Engineering (IIT-JEE, AIEEE, GATE), Employment (IAS, Bank PO, Railway, UGCNET), Civil Services and many more. We bring you the best in education by providing technical excellence and creating innovative solutions. We provide facility for online test preparation that offers 24/7 access to relevant subject matter and relative tests. These test preparations help the students to groom themselves and get prepared before actually facing the examination.