Please complete and check my code in Java (eclipse). Complete the instructions (please see images). Please add comments. package HW5;enum Color { YELLOW, ORANGE, RED, PURPLE;} public class Fruit{ private Color color; private int calories; private double pricePerPound; protected static int numberOfFruits;//Constructor a default fruit object Fruit(){ numberOfFruits++; } Fruit(Color color, int calories, double pricePerPound){ this.color=color; this.calories=calories; this.pricePerPound= pricePerPound; numberOfFruits++; } /////generate getters & setterspublic Color getColor() { return color;}public void setColor(Color color) { this.color = color;}public int getCalories() { return calories;}public void setCalories(int calories) { this.calories = calories;}public double getPricePerPound() { return pricePerPound;}public void setPricePerPound(double pricePerPound) { this.pricePerPound = pricePerPound;}public static int getNumberOfFruits() { return numberOfFruits;}public static void setNumberOfFruits(int numberOfFruits) { Fruit.numberOfFruits = numberOfFruits;}@Overridepublic String toString() { return "\ncolor: "+ color + "Calories: "+ calories + "pricePerPound: "+ pricePerPound;}} package HW5;//Child class #1public class Apple extends Fruit { private String variety; private String texture;//default constructor Apple(){ super(); } Apple(String variety, String texture, Color color, int calories, double pricePerPound){ super (color,calories, pricePerPound); this.variety=variety; this.texture=texture;}/////generate getters & setterspublic String getVariety() { return variety;}public void setVariety(String variety) { this.variety = variety;}public String getTexture() { return texture;}public void setTexture(String texture) { this.texture = texture;}@Overridepublic String toString() { return "\ncolor: "+ getColor() + "Calories: "+ getCalories() + "pricePerPound: "+ getPricePerPound()+ "\nvariety: "+ getVariety() +"\ntexture: "+ getTexture(); }}package HW5;//Child class #2public class Grapes extends Fruit { private String taste; private boolean hasSeed;//default constructor Grapes(){ super(); } Grapes( String taste, boolean hasSeed, Color color, int calories, double pricePerPound){ super (color,calories, pricePerPound); this.taste=taste; this.hasSeed=hasSeed; } ////////generate getters & setterspublic String getTaste() { return taste;}public void setTaste(String taste) { this.taste = taste;}public boolean isHasSeed() { return hasSeed;}public void setHasSeed(boolean hasSeed) { this.hasSeed = hasSeed;}@Overridepublic String toString() { return "\ntaste: "+ getTaste() +"\ncolor: "+ getColor() + "Calories: "+ getCalories() + "pricePerPound: "+ getPricePerPound();}} Part 3. Create a test class “TestPolymorphism.java” in the same package. Inside its main() method do the following steps. Some steps ask to provide explanations for questions. Provide the answers in a separate PDF file.a) Create two Fruit objects “fruit1” and “fruit2” using the two constructors respectively.b) Display the total number of fruits using the getNumberOfFruits() method.c) Create a new Apple object “apple1” using the no-arg constructor and assign it to the object reference variable of type Fruit. (i.e., Apple is a subtype of Fruit)d) Create a new Apple object “apple2” using the overloaded constructor that has arguments and assign it to the object reference variable of type Fruit. (i.e., Apple is a subtype of Fruit)e) Repeat step (c) and step (d) for “Grape” class. Create two Grape objects “grape1” and “grape2” and assign them to the object reference variable of type Fruit. (i.e., Grape as a subtype of Fruit).f) Display the total number of fruits using the getNumberOfFruits() method.g) Display the actual class of “fruit1”, “fruit2”, “apple1” and “apple2” objects. Refer to the following example. ```java System.out.println("The actual class is " + fruit1.getClass()); ```h) Display the result to test whether “fruit1” and “apple1” objects are equal. Refer to the following example. Provide an answer explaining the output. ```java System.out.println("Is objects fruit1 and apple1 equal? " + (fruit1).equals(apple1)); ```i) Display the result to test whether “fruit2” and “grape2” objects are equal. (example in step g))j) Answer the question: Can you display the texture of the apple object “apple2” by calling getTexture() method as below? Why or Why not? ```java System.out.println(apple2.getTexture()); ```k) Answer the question: Can you display the taste of the grape object “grape2” by calling getTaste() method? ```java System.out.println(grape2.getTaste()); ```m) Change the color of “apple2” to p) Create a new method `displayObject()` that takes one argument. The argument type is an object for the "Object" class. Method header:```javapublic static void displayObject(Object obj)```q) This method will display the contents of "obj" only if this object belongs to either the Fruit or Apple or Grape class. You have to use the `toString()` method and `instanceof` operator in this method implementation. Do not use any casting technique inside this method. (Hint: Use if - else if conditions.) NOTE: The output displayed from your objects should be relevant and appropriate based on its class methods.r) Call the method `displayObject()` by passing each object (created in all the previous steps) as a parameter in separate function calls.

equals method is not overridden and as hash codes are different, equals method return false Statement mentioned in k is invalid because this references Fruit not Apple Statement mentioned in l is invalid because this references Fruit not Grape package HW5; public class TestPolymorphism { public static void main(String[] args) { Fruit fruit1=new Fruit(); Fruit fruit2=new Fruit(Color.ORANGE, 25, 10); System.out.println(Fruit.getNumberOfFruits()); Fruit apple1=new Apple(); Fruit apple2=new Apple("Royal Gala", "Smooth", Color.RED, 80, 40); Fruit grape1=new Grapes(); Fruit grape2=new Grapes("sour", true, Color.PURPLE, 30, 30); System.out.println(Fruit.getNumberOfFruits()); System.out.println("The actual class is "+fruit1.getClass()); System.out.println("The actual class is "+fruit2.getClass()); System.out.println("The actual class is "+apple1.getClass()); System.out.println("The actual class is "+apple2.getClass()); System.out.println("Is objects fruit1 and apple1 equal? "+(fruit1).equals(apple1)); //both are different objects and has different hascodes and thus false System.out.println("The actual class is "+grape1.getClass()); System.out.println("The actual class is "+grape2.getClass()); System.out.println("Is objects fruit2 and grape2 equal? "+(fruit2).equals(grape2)); //both are different objects and has different hascodes and thus false //System.out.println(apple2.getTexture()); //is invalid because this references Fruit not Apple //System.out.println(grape2.getTaste()); //is invalid because this references Fruit not Grape System.out.println(((Apple)apple2).getTexture()); //This is valid and it will print Smooth System.out.println(((Grapes)grape2).getTaste()); //This is valid and it will print sour //calling method by passing each object display(fruit1); display(fruit2); display(apple1); display(apple2); display(grape1); display(grape2); } public static void display(Object obj) { if(obj instanceof Fruit || obj instanceof Apple || obj instanceof Grapes) { //if it's valid instance System.out.println(obj.toString()); //print the data } }}

Answered: Part 3. Create a test class…

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

Please complete and check my code in Java (eclipse). Complete the instructions (please see images). Please add comments.

package HW5;
enum Color {
YELLOW, ORANGE, RED, PURPLE;
}

public class Fruit{
private Color color;
private int calories;
private double pricePerPound;
protected static int numberOfFruits;
//Constructor a default fruit object
Fruit(){
numberOfFruits++;
}
Fruit(Color color, int calories, double pricePerPound){
this.color=color;
this.calories=calories;
this.pricePerPound= pricePerPound;
numberOfFruits++;
}

/////generate getters & setters
public Color getColor() {
return color;
}
public void setColor(Color color) {
this.color = color;
}
public int getCalories() {
return calories;
}
public void setCalories(int calories) {
this.calories = calories;
}
public double getPricePerPound() {
return pricePerPound;
}
public void setPricePerPound(double pricePerPound) {
this.pricePerPound = pricePerPound;
}
public static int getNumberOfFruits() {
return numberOfFruits;
}
public static void setNumberOfFruits(int numberOfFruits) {
Fruit.numberOfFruits = numberOfFruits;
}
@Override
public String toString() {
return "\ncolor: "+ color + "Calories: "+ calories + "pricePerPound: "+ pricePerPound;
}
}

package HW5;
//Child class #1
public class Apple extends Fruit {
private String variety;
private String texture;
//default constructor
Apple(){
super();
}
Apple(String variety, String texture, Color color, int calories, double pricePerPound){
super (color,calories, pricePerPound);
this.variety=variety;
this.texture=texture;
}
/////generate getters & setters
public String getVariety() {
return variety;
}

public void setVariety(String variety) {
this.variety = variety;
}

public String getTexture() {
return texture;
}

public void setTexture(String texture) {
this.texture = texture;
}
@Override
public String toString() {
return "\ncolor: "+ getColor() + "Calories: "+ getCalories() + "pricePerPound: "+ getPricePerPound()+
"\nvariety: "+ getVariety() +"\ntexture: "+ getTexture();

}
}

package HW5;

//Child class #2
public class Grapes extends Fruit {
private String taste;
private boolean hasSeed;
//default constructor
Grapes(){
super();
}
Grapes( String taste, boolean hasSeed, Color color, int calories, double pricePerPound){
super (color,calories, pricePerPound);
this.taste=taste;
this.hasSeed=hasSeed;
}
////////generate getters & setters
public String getTaste() {
return taste;
}
public void setTaste(String taste) {
this.taste = taste;
}
public boolean isHasSeed() {
return hasSeed;
}
public void setHasSeed(boolean hasSeed) {
this.hasSeed = hasSeed;
}
@Override
public String toString() {
return "\ntaste: "+ getTaste() +"\ncolor: "+ getColor() +
"Calories: "+ getCalories() + "pricePerPound: "+
getPricePerPound();
}
}

Part 3. Create a test class “TestPolymorphism.java” in the same package. Inside its main() method do the following steps. Some steps ask to provide explanations for questions. Provide the answers in a separate PDF file.

a) Create two Fruit objects “fruit1” and “fruit2” using the two constructors respectively.

b) Display the total number of fruits using the getNumberOfFruits() method.

c) Create a new Apple object “apple1” using the no-arg constructor and assign it to the object reference variable of type Fruit. (i.e., Apple is a subtype of Fruit)

d) Create a new Apple object “apple2” using the overloaded constructor that has arguments and assign it to the object reference variable of type Fruit. (i.e., Apple is a subtype of Fruit)

e) Repeat step (c) and step (d) for “Grape” class. Create two Grape objects “grape1” and “grape2” and assign them to the object reference variable of type Fruit. (i.e., Grape as a subtype of Fruit).

f) Display the total number of fruits using the getNumberOfFruits() method.

g) Display the actual class of “fruit1”, “fruit2”, “apple1” and “apple2” objects. Refer to the following example.

```java
System.out.println("The actual class is " + fruit1.getClass());
```

h) Display the result to test whether “fruit1” and “apple1” objects are equal. Refer to the following example. Provide an answer explaining the output.

```java
System.out.println("Is objects fruit1 and apple1 equal? " + (fruit1).equals(apple1));
```

i) Display the result to test whether “fruit2” and “grape2” objects are equal. (example in step g))

j) Answer the question: Can you display the texture of the apple object “apple2” by calling getTexture() method as below? Why or Why not?

```java
System.out.println(apple2.getTexture());
```

k) Answer the question: Can you display the taste of the grape object “grape2” by calling getTaste() method?

```java
System.out.println(grape2.getTaste());
```

m) Change the color of “apple2” to

p) Create a new method `displayObject()` that takes one argument. The argument type is an object for the "Object" class. Method header:
```java
public static void displayObject(Object obj)
```

q) This method will display the contents of "obj" only if this object belongs to either the Fruit or Apple or Grape class. You have to use the `toString()` method and `instanceof` operator in this method implementation. Do not use any casting technique inside this method. (Hint: Use if - else if conditions.) NOTE: The output displayed from your objects should be relevant and appropriate based on its class methods.

r) Call the method `displayObject(<param>)` by passing each object (created in all the previous steps) as a parameter in separate function calls.

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