Answered: What is the output of the following…

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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Question

What is the output of the following code? Explain each line of the console output in your
own words. (HINT: if there are errors, please explain why the errors occur)

import java.util.ArrayList;
public class Pet {
public void goToVet(){
System.out.println("My Pet needs to go to Vet ...");
}
public static void main(String args[]){
Hamster pug = new Hamster();
Pet sally = new Pet();
Pet loki = new Hamster();
Object sunny = new Object();
Object joy = new Pet();
Object mini = new Hamster();
ArrayList<Object> myList = new ArrayList<>();

myList.add(pug);

myList.add(sally);
myList.add(loki);
myList.add(sunny);
myList.add(joy);
myList.add(mini);
myList.forEach(i -> {
if (i instanceof Hamster) {
System.out.println("My Pet is cute: so " + (((Hamster) i).cute())
+ "! ");
((Hamster) i).goToVet();
}
else if (i instanceof Pet)
((Pet) i).goToVet();
else
System.out.println("This is not a Pet");
});
}
}
class Hamster extends Pet {
public void goToVet(){
System.out.println("My Hamster needs to go to Vet ...");
}
public boolean cute(){
return true;
}
}

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