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итак, у нас есть задание о счетчике возврата. Я хочу вернуться к процессу, если вы ввели сумму, которой недостаточно для вашей цены. Кажется, я не могу этого сделать, потому что, когда я пытаюсь выполнить цикл «do», отсканированные данные не будут считаны «while ()». Вот и все, спасибо.

это весь код, процесс, с которого начинается моя проблема, находится в «// сумма наличных покупателей»

 package prelim.activities;
import java.lang.annotation.Repeatable;
import java.util.Scanner;
public class test{
    public static void main(String[] args) {
        //choosing of product
        System.out.println("Welcome to Aling Nena's Store. What do you want to buy?");
        System.out.println("nEnter 1 for Milk");

        //scanners and booleans for product type
        Scanner scanner = new Scanner(System.in);
        String product = scanner.nextLine();
        boolean milk = true;

        //if statements for milk
        if(milk){
            System.out.println("nThis will cost P15 each, how much would you like to buy?");

        //scanners and booleans for product price
        Scanner scanner_price = new Scanner(System.in);
        int amount = scanner_price.nextInt();
        int price = 15 * amount;
        System.out.println("nYour product costs P"   price);

        //amount of buyers cash
        
        System.out.println("nPlease enter how much will you pay");
        Scanner money = new Scanner(System.in);
        int cash = money.nextInt();
        
        
        
        //if statement for not enough cash
        if(cash < price){
            System.out.println("Sorry, your cash is not enough. Please enter amount again");
            // this is the part where I want to go back to "amount of buyers cash"
        }
            

        if(cash >= price){
            int change = cash - price;
            System.out.println("nYour change is P"   change);
            System.out.println("nThank you! Come again next time.");
            System.exit(0);
        }
        
    }
}}
  

Я думаю, вам просто нужно изменить условие if на условие while при проверке, превышает ли цена наличные.

 package prelim.activities;
import java.util.Scanner;
public class test{
public static void main(String[] args) {
    //choosing of product
    System.out.println("Welcome to Aling Nena's Store. What do you want to buy?");
    System.out.println("nEnter 1 for Milk");

    //scanners and booleans for product type
    Scanner scanner = new Scanner(System.in);
    String product = scanner.nextLine();
    boolean milk = true;

    //if statements for milk
    if(milk){
        System.out.println("nThis will cost P15 each, how much would you like to buy?");

    //scanners and booleans for product price
    Scanner scanner_price = new Scanner(System.in);
    int amount = scanner_price.nextInt();
    int price = 15 * amount;
    System.out.println("nYour product costs P"   price);

    //amount of buyers cash
    
    System.out.println("nPlease enter how much will you pay");
    Scanner money = new Scanner(System.in);
    int cash = money.nextInt();
    
    
    
    //if statement for not enough cash
    while(cash < price){
        System.out.println("Sorry, your cash is not enough. Please enter amount again");
        // this is the part where I want to go back to "amount of buyers cash"
        Scanner money1 = new Scanner(System.in);
         cash = money1.nextInt();
    }
        

    if(cash >= price){
        int change = cash - price;
        System.out.println("nYour change is P"   change);
        System.out.println("nThank you! Come again next time.");
        System.exit(0);
    }
    
}
}}
  

Если я правильно понимаю, вы хотите обновлять цену каждый раз, для этого вам нужно изменить область действия цены

 package prelim.activities;
import java.lang.annotation.Repeatable;
import java.util.Scanner;
public class test{
    public static void main(String[] args) {
        //choosing of product
        System.out.println("Welcome to Aling Nena's Store. What do you want to buy?");
        System.out.println("nEnter 1 for Milk");

        //scanners and booleans for product type
        Scanner scanner = new Scanner(System.in);
        String product = scanner.nextLine();
        boolean milk = true;

// price moved here so it will be accessible through out the method.
        int price = 0;

        //if statements for milk
        if(milk){
            System.out.println("nThis will cost P15 each, how much would you like to buy?");

        //scanners and booleans for product price
        Scanner scanner_price = new Scanner(System.in);
        int amount = scanner_price.nextInt();
        price = 15 * amount;
        System.out.println("nYour product costs P"   price);

        //amount of buyers cash
        
        System.out.println("nPlease enter how much will you pay");
        Scanner money = new Scanner(System.in);
        int cash = money.nextInt();
        
        
        
        //if statement for not enough cash
        if(cash < price){
            System.out.println("Sorry, your cash is not enough. Please enter amount again");
            // this is the part where I want to go back to "amount of buyers cash"
        }
            

        if(cash >= price){
            int change = cash - price;
            System.out.println("nYour change is P"   change);
            System.out.println("nThank you! Come again next time.");
            System.exit(0);
        }
        
    }
}}