public interface Joy ( public void happySign(); } public class Man implements Joy { public Man () { } public void happySign () { System.out.println("smiles"); } public void sadSign () { } System.out.println("frowns"); public class Dog implements Joy ( public Dog () {} public void happySign () { } a) Joy obj1 = new Man(); obj1.sadSign(); System.out.println("wags tail"); public class GuardDog extends Dog { public GuardDog () { } public void happySign () { System.out.println("barks"); } public void angrySign () { } System.out.println("growls"); If the following lines of code appeared in the main method of a driver program, would the program compile and run? (yes or no?) If no, write 1-2 sentences to explain why not. If yes, indicate what the output would be.
public interface Joy ( public void happySign(); } public class Man implements Joy { public Man () { } public void happySign () { System.out.println("smiles"); } public void sadSign () { } System.out.println("frowns"); public class Dog implements Joy ( public Dog () {} public void happySign () { } a) Joy obj1 = new Man(); obj1.sadSign(); System.out.println("wags tail"); public class GuardDog extends Dog { public GuardDog () { } public void happySign () { System.out.println("barks"); } public void angrySign () { } System.out.println("growls"); If the following lines of code appeared in the main method of a driver program, would the program compile and run? (yes or no?) If no, write 1-2 sentences to explain why not. If yes, indicate what the output would be.
Chapter11: Advanced Inheritance Concepts
Section: Chapter Questions
Problem 3PE
Related questions
Concept explainers
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
Question
![public interface Joy (
public void happySign();
}
public class Man implements Joy {
public Man () { }
public void happySign () {
System.out.println("smiles");
}
public void sadSign () {
}
red phot
System.out.println("frowns");
a) Joy obj1 = new Man();
obj1.sadSign();
public class Dog implements Joy {
public Dog () ()
public void happySign () {
}
System.out.println("wags tail");
public class GuardDog extends Dog {
public GuardDog () { }
public void happySign () {
System.out.println("barks");
}
We public void angrySign () {
}
System.out.println("growls");
If the following lines of code appeared in the main method of a driver program, would
the program compile and run? (yes or no?) If no, write 1-2 sentences to explain why not.
If yes, indicate what the output would be.
nafn,](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F356c0752-7c2d-4125-be60-fb5773f69bd9%2F27cbf938-b589-4353-9ddd-04ca7607168c%2Fie2b5gk_processed.png&w=3840&q=75)
Transcribed Image Text:public interface Joy (
public void happySign();
}
public class Man implements Joy {
public Man () { }
public void happySign () {
System.out.println("smiles");
}
public void sadSign () {
}
red phot
System.out.println("frowns");
a) Joy obj1 = new Man();
obj1.sadSign();
public class Dog implements Joy {
public Dog () ()
public void happySign () {
}
System.out.println("wags tail");
public class GuardDog extends Dog {
public GuardDog () { }
public void happySign () {
System.out.println("barks");
}
We public void angrySign () {
}
System.out.println("growls");
If the following lines of code appeared in the main method of a driver program, would
the program compile and run? (yes or no?) If no, write 1-2 sentences to explain why not.
If yes, indicate what the output would be.
nafn,
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