HW4

//Christina Zimmer

import java.util.Scanner;
import java.util.ArrayList;
import java.util.Collections;


class Taco implements Comparable {
     String name;
     double price;

     public Taco(String name, double price) {
         this.name = name;
         this.price = price;
     }

     public String toString() {
         String formattedPrice = String.format("$%.2f", this.price);
         return this.name + " - " + formattedPrice;
     }

    @Override
    public int compareTo(Object otherTaco) {
         double otherPrice=((Taco)otherTaco).price;
            /* For Ascending order of prices*/

            if(this.price < otherPrice) {
                return -1;
            } else {
                return 0;
            }
    }
}

public class HW4{


     public static void main(String []args){
         ArrayList<Taco> tacoList = new ArrayList<Taco>();

         int tacosNeeded = 10;  //needed is variadic for convenience

         //2 scanners instead of 1 so there's no carriage consumption manipulations
         Scanner sNames = new Scanner(System.in);  //scans strings only
         Scanner sPrices = new Scanner(System.in); //scans only doubles

         System.out.println("Welcome to the taco price sorter! Enter 10 taco names and prices and I’ll sort it!");

         //repeat 10 times to populate parallel arrays
         for(int i = 0; i < tacosNeeded; i++) {
             System.out.print("\nEnter name of taco " + (i+1) + ": ");
             String tacoName = sNames.nextLine();

             System.out.print("Enter price of taco " + (i+1) + ": ");
             double tacoPrice = sPrices.nextDouble();

             while(tacoPrice < 0) {
                 //cheeky error message!
                 System.out.print("\nError! Taco's cant be freeeee!\n(Enter a positive dollar amount this time): ");
                 tacoPrice = sPrices.nextDouble();
             }

             tacoList.add(new Taco(tacoName, tacoPrice));
         }

         //sort backed by mergesort, overridden in compareTo in Taco
         Collections.sort(tacoList);

         System.out.println();

         //iterate through and output all the Tacos, ordered by price
         for(Taco t : tacoList) {
             System.out.println(t.toString());
         }
     }
}