class Animal{} class Dog extends Animal{} class Wolf extends Animal{} public class HelloWorld{ public static void main (String [] args) Animal a; Dog d = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; d = (Dog) a; //Line3 //Line4 w = (Wolf) a; //Line5
class Animal{} class Dog extends Animal{} class Wolf extends Animal{} public class HelloWorld{ public static void main (String [] args) Animal a; Dog d = new Dog(); //Line1 Wolf w = new Wolf(); //Line2 a = d; d = (Dog) a; //Line3 //Line4 w = (Wolf) a; //Line5
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
Which line contains error and why. Explain why others are correct.
![class Animal{}
class Dog extends Animal{}
class Wolf extends Animal{}
public class HelloWorld{
public static void main (String [] args)
Animal a;
Dog d = new Dog(); //Line1
Wolf w
= new Wolf(); //Line2
a = d;
d = (Dog) a;
//Line3
//Line4
%3D
w = (Wolf) a;
//Line5
%3D
}
}
Select one:
a.Line 1
b.Line 5
c.Line 4
d.Line 3
e.Line 2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F72fd9163-e2b0-4930-976d-a5887f408788%2F137ebfc6-321b-437a-8174-7acc7f7cdeb7%2F184ih2g_processed.jpeg&w=3840&q=75)
Transcribed Image Text:class Animal{}
class Dog extends Animal{}
class Wolf extends Animal{}
public class HelloWorld{
public static void main (String [] args)
Animal a;
Dog d = new Dog(); //Line1
Wolf w
= new Wolf(); //Line2
a = d;
d = (Dog) a;
//Line3
//Line4
%3D
w = (Wolf) a;
//Line5
%3D
}
}
Select one:
a.Line 1
b.Line 5
c.Line 4
d.Line 3
e.Line 2
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