What is the comparTo method used in the code? public class Drink extends Product

Question

What is the comparTo method used in the code?   

public class Drink extends Product implements Comparable<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;
    }
}

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;
    }
    // Temporary compares the name of the products, returns 1 if equal or -1 if
// not. Will be needed later.
    @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;
    }
}

public class Snack extends Product implements Comparable<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;
    }
}

Explanation / Answer

class Drink and Snack are the suclass (child) of Product class.

compareTo method has defined in Product method:

public int compareTo(Product other) {
        int result = 0;
        if ((this.name).equals(other.name)) {
            result = 1;
        } else {
            result = -1;
        }
        return result;
    }

compareTo method comparing two Product object based on name of the products.

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