What compareTo method is used here and does it compare name alphapbetically then
ID: 3702187 • Letter: W
Question
What compareTo method is used here and does it compare name alphapbetically then by their price.
import java.time.LocalDate;
import java.time.ZoneId;
import java.util.Date;
public class Product implements Comparable<Product> {
// Shared Properties
private String name;
private String brand;
private String foodGroup;
private double price;
// Nutrition Facts
private double sugar;
private double protein;
private double sodium;
private double calories;
// Expiration Date - format mm/dd/yyyy
private String expirationDate;
// Default Constructor
public Product() {
this.name = null;
this.brand = null;
this.foodGroup = null;
this.price = 0.0;
this.sugar = 0.0;
this.protein = 0.0;
this.sodium = 0.0;
this.calories = 0.0;
this.setExpirationDate(calculateExpirationDate());
}
// Parameterized Constructor
public Product(String name, String brand, String foodGroup, double price,
double sugar, double protein, double sodium, double calories) {
this.name = name;
this.brand = brand;
this.foodGroup = foodGroup;
this.price = price;
this.sugar = sugar;
this.protein = protein;
this.sodium = sodium;
this.calories = calories;
this.setExpirationDate(calculateExpirationDate());
}
// Copy Constructor
public Product(Product productToCopy) {
this.name = productToCopy.getName();
this.brand = productToCopy.getBrand();
this.foodGroup = productToCopy.getFoodGroup();
this.price = productToCopy.getPrice();
this.sugar = productToCopy.getSugar();
this.protein = productToCopy.getProtein();
this.sodium = productToCopy.getSodium();
this.calories = productToCopy.getCalories();
this.setExpirationDate(calculateExpirationDate());
}
public String toString() {
StringBuilder resultStringBuilder = new StringBuilder();
resultStringBuilder.append(this.getName() + " ");
resultStringBuilder.append(this.getBrand() + " ");
resultStringBuilder.append(this.getPrice() + " ");
resultStringBuilder.append(this.getSugar() + " ");
resultStringBuilder.append(this.getProtein() + " ");
resultStringBuilder.append(this.getSodium() + " ");
resultStringBuilder.append(this.getCalories() + " ");
resultStringBuilder.append(this.getExpirationDate() + " ");
String result = resultStringBuilder.toString();
return result;
}
@Override
public int compareTo(Product other) {
int result = 0;
if ((this.name).equals(other.name)) {
result = 1;
} else {
result = -1;
}
return result;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public String getFoodGroup() {
return foodGroup;
}
public void setFoodGroup(String foodGroup) {
this.foodGroup = foodGroup;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public double getSugar() {
return sugar;
}
public void setSugar(double sugar) {
this.sugar = sugar;
}
public double getProtein() {
return protein;
}
public void setProtein(double protein) {
this.protein = protein;
}
public double getSodium() {
return sodium;
}
public void setSodium(double sodium) {
this.sodium = sodium;
}
public double getCalories() {
return calories;
}
public void setCalories(double calories) {
this.calories = calories;
}
public String getExpirationDate() {
return expirationDate;
}
public void setExpirationDate(String expirationDate) {
this.expirationDate = expirationDate;
}
public String calculateExpirationDate() {
Date today = new Date();
LocalDate localDate = today.toInstant().atZone(ZoneId.systemDefault())
.toLocalDate();
int year = localDate.getYear();
int month = localDate.getMonthValue();
int day = localDate.getDayOfMonth();
// For Drinks, add 9 months
if (this.getClass().getSimpleName().equals("Drink"))
month += 9;
// For Chips, add 3 months
if (this.getClass().getSimpleName().equals("Chips"))
month += 3;
// For Candy, add 6 months
if (this.getClass().getSimpleName().equals("Candy"))
month += 6;
// For Gum, add 1 year
if (this.getClass().getSimpleName().equals("Drink"))
year += 1;
String expDate = month + "/" + day + "/" + year;
return expDate;
}
}
/**** Snack.java ***/
package learning;
public class Snack extends Product {
private String productType = "snack";
private boolean isSnack = true;
public Snack() {
super();
}
public static void main(String[] args) {
Product p1 = new Product("Drink 1", "power-c", "Vitamin Water", 0.99,
12.32, 23, 34, 3);
System.out.println(p1);
Product p2 = new Product("Drink 2", "vital-t", "Vitamin water", 0.99,
12.32, 23, 34, 3);
System.out.println(p2);
System.out.println("p1.compareTo(p2) : " + p1.compareTo(p2));
System.out.println("p2.compareTo(p2) : " + p2.compareTo(p2));
Snack s1 = new Snack(p1);
Snack s2 = new Snack(p2);
System.out.println("s1.compareTo(s2) : " + s1.compareTo(s2));
System.out.println("s2.compareTo(s2) : " + s2.compareTo(s2));
}
public String getProductType() {
return productType;
}
public boolean isSnack() {
return isSnack;
}
public Snack(String name, String brand, String foodGroup, double price,
double sugar, double protein, double sodium, double calories) {
super(name, brand, foodGroup, price, sugar, protein, sodium, calories);
}
// Copy Constructor
public Snack(Product productToCopy) {
super();
this.setName(productToCopy.getName());
this.setBrand(productToCopy.getBrand());
this.setFoodGroup(productToCopy.getFoodGroup());
this.setPrice(productToCopy.getPrice());
this.setSugar(productToCopy.getSugar());
this.setProtein(productToCopy.getProtein());
this.setSodium(productToCopy.getSodium());
this.setExpirationDate(productToCopy.getExpirationDate());
}
@Override
public String toString() {
StringBuilder resultStringBuilder = new StringBuilder();
resultStringBuilder.append(this.getName() + " ");
resultStringBuilder.append(this.getBrand() + " ");
resultStringBuilder.append(this.getPrice() + " ");
resultStringBuilder.append(this.getSugar() + " ");
resultStringBuilder.append(this.getProtein() + " ");
resultStringBuilder.append(this.getSodium() + " ");
resultStringBuilder.append(this.getCalories() + " ");
resultStringBuilder.append(this.getExpirationDate() + " ");
String result = resultStringBuilder.toString();
return result;
}
@Override
public int compareTo(Product product){
if(product instanceof Snack){
int result = (this.getName()).compareTo(product.getName());
if(result ==0 ){
if((this.getPrice()) == (product.getPrice())){
return 0;
}else if((this.getPrice()) > (product.getPrice())){
return 1;
}else{
return -1;
}
}else{
return result;
}
}else{
return super.compareTo(product);
}
}
}
/*** Drink.java***/
package learning;
public class Drink extends Product {
private String productType = "drink";
private boolean isDrink = true;
public Drink() {
// TODO Auto-generated constructor stub
super();
}
public static void main(String[] args) {
Product p1 = new Product("Drink 1", "power-c", "Vitamin Water", 0.99,
12.32, 23, 34, 3);
System.out.println(p1);
Product p2 = new Product("Drink 2", "vital-t", "Vitamin water", 0.99,
12.32, 23, 34, 3);
System.out.println(p2);
System.out.println("p1.compareTo(p2) : " + p1.compareTo(p2));
System.out.println("p2.compareTo(p2) : " + p2.compareTo(p2));
Drink d1 = new Drink(p1);
Drink d2 = new Drink(p2);
System.out.println("d1.compareTo(d2) : " + d1.compareTo(d2));
System.out.println("d2.compareTo(d2) : " + d2.compareTo(d2));
}
public String getProductType() {
return productType;
}
public boolean isDrink() {
return isDrink;
}
public Drink(String name, String brand, String foodGroup, double price,
double sugar, double protein, double sodium, double calories) {
super(name, brand, foodGroup, price, sugar, protein, sodium, calories);
}
// Copy Constructor
public Drink(Product productToCopy) {
super();
this.setName(productToCopy.getName());
this.setBrand(productToCopy.getBrand());
this.setFoodGroup(productToCopy.getFoodGroup());
this.setPrice(productToCopy.getPrice());
this.setSugar(productToCopy.getSugar());
this.setProtein(productToCopy.getProtein());
this.setSodium(productToCopy.getSodium());
this.setExpirationDate(productToCopy.getExpirationDate());
}
@Override
public String toString() {
StringBuilder resultStringBuilder = new StringBuilder();
resultStringBuilder.append("Drink: " + " ");
resultStringBuilder.append(this.getName() + " ");
resultStringBuilder.append(this.getBrand() + " ");
resultStringBuilder.append(this.getPrice() + " ");
resultStringBuilder.append(this.getSugar() + " ");
resultStringBuilder.append(this.getProtein() + " ");
resultStringBuilder.append(this.getSodium() + " ");
resultStringBuilder.append(this.getCalories() + " ");
resultStringBuilder.append(this.getExpirationDate() + " ");
String result = resultStringBuilder.toString();
return result;
}
@Override
public int compareTo(Product product){
if(product instanceof Drink){
int result = (this.getName()).compareTo(product.getName());
if(result ==0 ){
if((this.getPrice()) == (product.getPrice())){
return 0;
}else if((this.getPrice()) > (product.getPrice())){
return 1;
}else{
return -1;
}
}else{
return result;
}
}else{
return super.compareTo(product);
}
}
}
Explanation / Answer
Yes the compareTo method used in product class is overriden by its child classes wherein the compareTo method comapres names first if they are equal then their prices are compared.The compareTo method in parent class compares only by names but not by their prices .
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