I am reposting this because I was told there was no compareTo() method. The items should be in alphabetical order by name then by their price and the compareTo() method is tested in main().

Here are the drinks each drink cost $ 0.99 cent each:

Drink 1. power-c", "Vitamin Water

Drink 2. vital-t", "Vitamin Water

Drink 3. XXX", "Vitamin Water

Drink 4. XXX", "Vitamin Water

Drink 5. XXX", "Vitamin Water

Drink 6. XXX", "Vitamin Water

Drink 7. XXX", "Vitamin Water

Drink 8. Original Coca-Cola

Drink 9. Vanilla Coca-Cola

Drink 10. Cherry Coca-Cola

Product code:

import java.time.LocalDate;
	import java.time.ZoneId;
	import java.util.Date;
	public abstract class Product implements Comparable{
	//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 abstract String toString();
	//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;
	}
	}

Snack code:

public abstract class Snack extends Product{
	private String productType = "snack";
	private boolean isSnack = true;
	public Snack() {
	super();
	}
	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;
	}
	}

Drink code:

public class Drink extends Product{
	private String productType = "drink";
	private boolean isDrink = true;
	public Drink() {
	// TODO Auto-generated constructor stub
	super();
	}
	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;
	}
	}