Java Community | Help. Code. Learn.•4mo ago

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I'm currently working on a simple program that takes user input to create a gorcery list with prices and item names. It's not giving me any error codes when I run but rather nothing is appearing. I'll attach a photo below.

16 Replies

JavaBot•4mo ago

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rainymc_OP•4mo ago

lisan•4mo ago

how do you want to take item if your itemNames has 0 elements so size is 0

rainymc_OP•4mo ago

so should i keep it at a set amount or ask the user for the amount of items beforehand and set that to the size?

lisan•4mo ago

u can even do while true, and if user wants to finish shopping he should write for example finish.

if (item.equals("finish")) break;

if (item.equals("finish")) break;

rainymc_OP•4mo ago

Would this work? I've tried running and am now getting a seperate problem

rainymc_OP•4mo ago

Carter•4mo ago

look up how to take in a Double it should be scanner.nextDouble() you're calling scanner.next()

rainymc_OP•4mo ago

Sorry for not updating the screenshot, I did notice that and fixed it earlier

lisan•4mo ago

write this code here, on chat

Omen•4mo ago

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

public class TotalPrice{
    public static void main(String[] args) {
        Scanner inpt = new Scanner(System.in);
        
        ArrayList<String> itemNames = new ArrayList<String>();
        ArrayList<Double> itemPrices = new ArrayList<Double>();

        for (int i = 0; i < itemNames.size(); i++) {
            String item = inpt.nextLine();
            System.out.println("Please type in the name of the item you would like to purchase: ");
            itemNames.add(item); //itemNames.add....system.in
            Double price = inpt.nextBoolean();
            System.out.println("Please type in the price of the item: ");
            itemPrices.add(price);
            if (item.equals("finish")) break;
            else {
                System.out.println("Error, please retype.");
            }
            
                  }
        }

        


           

        }

public class TotalPrice{
    public static void main(String[] args) {
        Scanner inpt = new Scanner(System.in);
        
        ArrayList<String> itemNames = new ArrayList<String>();
        ArrayList<Double> itemPrices = new ArrayList<Double>();

        for (int i = 0; i < itemNames.size(); i++) {
            String item = inpt.nextLine();
            System.out.println("Please type in the name of the item you would like to purchase: ");
            itemNames.add(item); //itemNames.add....system.in
            Double price = inpt.nextBoolean();
            System.out.println("Please type in the price of the item: ");
            itemPrices.add(price);
            if (item.equals("finish")) break;
            else {
                System.out.println("Error, please retype.");
            }
            
                  }
        }

        


           

        }

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lisan•4mo ago

public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        ArrayList<String> itemNames = new ArrayList<>();
        ArrayList<Double> itemPrices = new ArrayList<>();

        while (true) {
            System.out.println("Please type in the name of the item you would like to purchase or finish: ");
            String item = scanner.nextLine();
            if (item.equals("finish")) {
                break;
            } else {
                itemNames.add(item);
                System.out.println("Please type in the price of the item: ");
                Double price = scanner.nextDouble();
                scanner.nextLine();
                itemPrices.add(price);
            }
        }
        System.out.println(itemNames);
        System.out.println(itemPrices);

    }

public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        ArrayList<String> itemNames = new ArrayList<>();
        ArrayList<Double> itemPrices = new ArrayList<>();

        while (true) {
            System.out.println("Please type in the name of the item you would like to purchase or finish: ");
            String item = scanner.nextLine();
            if (item.equals("finish")) {
                break;
            } else {
                itemNames.add(item);
                System.out.println("Please type in the price of the item: ");
                Double price = scanner.nextDouble();
                scanner.nextLine();
                itemPrices.add(price);
            }
        }
        System.out.println(itemNames);
        System.out.println(itemPrices);

    }

JavaBot•4mo ago

If Scanner#nextLine reads an empty line after calling a different Scanner#next method, take a look at this StackOverflow post.

dan1st•4mo ago

You'll also run into this problem

JavaBot•4mo ago

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