如何将所有用户输入存储在 do while 循环中，并调用它们稍后在 Java 程序中打印？

您需要将每个输入存储在数组或集合中，例如 ArrayList。

如果选择使用数组，则可以询问用户将输入多少个项目，然后将该值用于数组的长度：

System.out.print("Enter the number of items in your cart: ");
int arraySize = scan.nextInt();

String[] itemNames = new String[arraySize];
double[] itemPrices = new double[arraySize];

如果您决定使用列表，则无需向用户询问列表大小，因为列表会动态扩展数据类型：

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

然后，对于循环的每次迭代，将值保存到数组/列表中：

System.out.print("Enter the number of items in your cart: ");
int arraySize = scan.nextInt();

String[] itemNames = new String[arraySize];
double[] itemPrices = new double[arraySize];

for(int i = 0; i < ararySize; i++) {
    System.out.println("Enter item " + (i + 1) + " and it's price:");

    itemNames[i] = scan.next();
    itemPrices[i] = scan.nextDouble();

    // ...    
}
// ...

或者对于列表方法：

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

do {
    System.out.println("Enter item " + i + " and it's price:");

    itemNames.add(scan.next());
    itemPrices.add(scan.nextDouble());

    // ...
} while (quest.equalsIgnoreCase("yes")); {
    // ...
}

然后，您可以遍历列表/数组以打印输出：

for(int i = 0; i < itemNames.length; i++) {
    String name = itemNames[i];
    double price = itemPrices[i];
    System.out.println("Item " + i + ": " + name + " Price: " + price + ",");
}

对于列表：

for(int i = 0; i < itemNames.size(); i++) {
    String name = itemNames.get(i);
    double price = itemPrices.get(i);
    System.out.println("Item " + i + ": " + name + " Price: " + price + ",");
}

我终于解决了任务。感谢所有帮助过的人，真的很感激。代码如下：

Scanner scan = new Scanner(System.in);
String itemName;
double price;
String[] items = new String[10];
double[] prices = new double[10];
int itemNumbers[] = new int[10];
String answer;
double total = 0;
int i = 1;

int index = 0;
do {
    System.out.println("Enter item " + i + " and it's price:");
    itemName = scan.next();
    price = scan.nextDouble();
    scan.nextLine();
    total = total + price;
    items[index] = itemName;
    prices[index] = price;
    itemNumbers[index] = i;
    index++;
    System.out.println("Add one more item?");
    answer = scan.next();
    i++;

} while (answer.equalsIgnoreCase("yes") && i <= 10); {
    for (int j = 0; j < index; j++) {
        System.out.print("Item " + itemNumbers[j] + ": " + items[j] + " price: " + prices[j] + ",");
    }
}
System.out.println("\nTotal price: " + total);

This version works too. Without arrays.

String shoppingList = "";
            String item = "";
            String addMore = "";
            double price = 0;
            int count = 1;
            double totalPrice = 0;

            do {
                System.out.println("Enter Item"+ count + " and its price:");
                item = scan.next();
                price = scan.nextDouble();
                shoppingList += ("Item" + count + ": " + item + " Price: " + price + ", ");
                totalPrice += price;
                System.out.println("Add one more item?");
                addMore = scan.next();
                count++;
            } while (addMore.equalsIgnoreCase("yes"));
            System.out.println(shoppingList.substring(0, shoppingList.length()-2));
            System.out.println("Total price: " + totalPrice);