4. Consider the following classes: public class Animal { public Animal(String itsNane) { name public void setName (String itsName) { name public String getName () { return name; } itsNane; } = itsName; %3D } www private String name; public class Dog extends Animal public Dog(String itsName) { super(itsName + "Dog"); sound = "Bark!"; { } public void setSound (String itsSound) { sound = public String getsound () { return (getNane (0) + sound); public String getName,(int choice) { if(choice > 0) return super getName() ; else itsSound; } wwww wA } wwww "AnyDog"; public String getName () { return super.getName () + "OK"; } private String sound; } In addition, the following lines of code has been placed in a main class public static void main(String[] args) Animal al = new Animal("Tweety"); { Animal a2 = new Dog ("Rover"); Dog d1 = new Dog("Spot"); } Give the values of the following expressions. If an expression is erroneous, state why. a) al.getName () i) d1 instanceof Animal j) al instanceof Dog k) al.getSound () b) a2.getName () c) a2.getName (0)
4. Consider the following classes: public class Animal { public Animal(String itsNane) { name public void setName (String itsName) { name public String getName () { return name; } itsNane; } = itsName; %3D } www private String name; public class Dog extends Animal public Dog(String itsName) { super(itsName + "Dog"); sound = "Bark!"; { } public void setSound (String itsSound) { sound = public String getsound () { return (getNane (0) + sound); public String getName,(int choice) { if(choice > 0) return super getName() ; else itsSound; } wwww wA } wwww "AnyDog"; public String getName () { return super.getName () + "OK"; } private String sound; } In addition, the following lines of code has been placed in a main class public static void main(String[] args) Animal al = new Animal("Tweety"); { Animal a2 = new Dog ("Rover"); Dog d1 = new Dog("Spot"); } Give the values of the following expressions. If an expression is erroneous, state why. a) al.getName () i) d1 instanceof Animal j) al instanceof Dog k) al.getSound () b) a2.getName () c) a2.getName (0)
Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![**4. Consider the following classes:**
```java
public class Animal {
public Animal(String itsName) { name = itsName; }
public void setName(String itsName) { name = itsName; }
public String getName() { return name; }
private String name;
}
public class Dog extends Animal {
public Dog(String itsName) {
super(itsName + "Dog");
sound = "Bark!";
}
public void setSound(String itsSound) { sound = itsSound; }
public String getSound() { return (getName() + sound); }
public String getName(int choice) {
if(choice > 0) return super.getName();
else return "AnyDog";
}
public String getName() { return super.getName() + "OK"; }
private String sound;
}
```
**In addition, the following lines of code have been placed in a main class:**
```java
public static void main(String[] args) {
Animal a1 = new Animal("Tweety");
Animal a2 = new Dog("Rover");
Dog d1 = new Dog("Spot");
...
}
```
**Give the values of the following expressions. If an expression is erroneous, state why.**
a) `a1.getName()`
- **Output:** `Tweety`
b) `a2.getName()`
- **Output:** `RoverDogOK`
c) `a2.getName(0)`
- **Error:** Method `getName(int)` is not available in `Animal`
d) `(new Animal()).getName()`
- **Error:** Constructor `Animal` requires a `String` argument
e) `d1.getName()`
- **Output:** `SpotDogOK`
f) `d1.getName(1)`
- **Output:** `SpotDog`
g) `((Animal)d1).getName()`
- **Output:** `SpotDogOK`
h) `((Dog)a1).getName()`
- **Error:** `Animal` cannot be cast to `Dog`
i) `d1 instanceof Animal`
- **Output:** `true`
j) `a1 instanceof Dog`
- **Output:** `false`
k) `a1.getSound()`
- **Error:** Method `getSound()` is not available in `Animal`
l) `a2.get](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb4deeaa2-280e-4afd-b08f-ce2df53e06a4%2F2fb714bb-3808-4232-8bb7-368df53bd141%2Fx5swgch_processed.png&w=3840&q=75)
Transcribed Image Text:**4. Consider the following classes:**
```java
public class Animal {
public Animal(String itsName) { name = itsName; }
public void setName(String itsName) { name = itsName; }
public String getName() { return name; }
private String name;
}
public class Dog extends Animal {
public Dog(String itsName) {
super(itsName + "Dog");
sound = "Bark!";
}
public void setSound(String itsSound) { sound = itsSound; }
public String getSound() { return (getName() + sound); }
public String getName(int choice) {
if(choice > 0) return super.getName();
else return "AnyDog";
}
public String getName() { return super.getName() + "OK"; }
private String sound;
}
```
**In addition, the following lines of code have been placed in a main class:**
```java
public static void main(String[] args) {
Animal a1 = new Animal("Tweety");
Animal a2 = new Dog("Rover");
Dog d1 = new Dog("Spot");
...
}
```
**Give the values of the following expressions. If an expression is erroneous, state why.**
a) `a1.getName()`
- **Output:** `Tweety`
b) `a2.getName()`
- **Output:** `RoverDogOK`
c) `a2.getName(0)`
- **Error:** Method `getName(int)` is not available in `Animal`
d) `(new Animal()).getName()`
- **Error:** Constructor `Animal` requires a `String` argument
e) `d1.getName()`
- **Output:** `SpotDogOK`
f) `d1.getName(1)`
- **Output:** `SpotDog`
g) `((Animal)d1).getName()`
- **Output:** `SpotDogOK`
h) `((Dog)a1).getName()`
- **Error:** `Animal` cannot be cast to `Dog`
i) `d1 instanceof Animal`
- **Output:** `true`
j) `a1 instanceof Dog`
- **Output:** `false`
k) `a1.getSound()`
- **Error:** Method `getSound()` is not available in `Animal`
l) `a2.get
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