Question

Please use Java and only Java.

You have been hired by your favorite restaurant to create a food nutrition app for their customers to use. Before you get too far, the owner wants you to create a quick prototype. Your app should output a food name and the number of calories, then ask the customer how many they want. You need to ask them for 3 menu items. Once they tell you the quantity for the three menu items, you will output the meal’s total calories. Behind the scenes, you are going to create a Food class. Your Food class should use name and calories in the constructor (in that order!). You should create getters and setters for these variables. You also need a toString method that will be used in the line before you ask for the quantity. In addition to the Food class, you will have a FoodRunner class where you will have your main method. In here, you will create your three foods and ask for the quantities. After that, you can use the quantities to calculate and output the total. Sample output: Hamburgers have 600 calories. How many would you like? 2 French Fries have 350 calories. How many would you like? 1 Coke have 200 calories. How many would you like? 2 Your meal will have a total of 1950 calories

Answer 1

check out the solution and do comment if any queries.

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import java.util.*; // imported for scanner class to get user input

// Food class
class Food {
// attributes
String name;
int calories;
  
// default constructor
Food() {
name = "";
calories = 0;
}
// setters
void setName(String n) {
this.name = n;
}
void setCalories(int cal) {
this.calories = cal;
}
// getters
String getName() {
return this.name;
}
int getCalories() {
return this.calories;
}
// toString method returns food name and calories
public String toString() {
return "\n" + this.name + " have " + this.calories + " calories.";
}
}

public class FoodRunner {
public static void main(String args[]) {
// Scanner class object instantiation
Scanner input = new Scanner(System.in);
  
// instantiation of 3 Food class objects
Food food1 = new Food();
Food food2 = new Food();
Food food3 = new Food();
  
// set food names and their respective calories using setters methods
food1.setName("Hamburgers");
food1.setCalories(600);
  
food2.setName("French Fries");
food2.setCalories(350);
  
food3.setName("Coke");
food3.setCalories(200);
  
// print food 1 details using toString method
System.out.println(food1);
// ask user for quantity
System.out.print("How many would you like? ");
// get user input
int q1 = input.nextInt();
  
// similarly for food 2 and 3
System.out.println(food2);
System.out.print("How many would you like? ");
int q2 = input.nextInt();
  
System.out.println(food3);
System.out.print("How many would you like? ");
int q3 = input.nextInt();
  
// find the total meals calorie
int total;
// get the calories of respective foods using getters and multiply them with quantity
// sum up all results to get the total meals calories
total = (q1 * food1.getCalories()) + (q2 * food2.getCalories()) + (q3 * food3.getCalories());
  
// display the result
System.out.println("\nYour meal will have a total of " + total + " calories.");
  
}
}

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Code :

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Output ::