Question

在这个程序中，我正在使用预设值从CarOrder类创建2个对象。然后，我要求用户另外两组值来创建另外两个对象。不幸的是，在输入第一个的税收状态后，它将跳过让用户在第二个上输入买方的值。为什么它会随机跳过这一个问题？

public static void main(String[] args)
{
    Scanner keyboard = new Scanner(System.in);
    CarOrder speedy = new CarOrder("Speedy Rental", "Mini Cooper", 22150, 15, true);
    CarOrder zip = new CarOrder("Zip Car Co.", "Ford Fusion", 27495, 6, true);

    System.out.println("Enter Buyer: ");
    String buyer1 = keyboard.nextLine();
    System.out.println("Enter the type of car being purchased: ");
    String car1 = keyboard.nextLine();
    System.out.println("Enter the cost of this purchase: ");
    double cost1 = keyboard.nextDouble();
    System.out.println("Enter quantity of cars being purchased: ");
    int quantity1 = keyboard.nextInt();
    System.out.println("Enter tax status: ");
    boolean tax1 = keyboard.nextBoolean();

    System.out.println("Enter Buyer: ");
    String buyer2 = keyboard.nextLine();
    System.out.println("Enter the type of car being purchased: ");
    String car2 = keyboard.nextLine();
    System.out.println("Enter the cost of this purchase: ");
    int cost2 = keyboard.nextInt();
    System.out.println("Enter quantity of cars being purchased: ");
    int quantity2 = keyboard.nextInt();
    System.out.println("Enter tax status: ");
    boolean tax2 = keyboard.nextBoolean();

    CarOrder state = new CarOrder(buyer1, car1, cost1, quantity1, tax1);
    CarOrder it = new CarOrder(buyer1, car2, cost2, quantity2, tax2);

    System.out.println("Chicago Car Wholesalers" );
    System.out.println("Oct. 30th, 2012");
    System.out.println("New Car Order Report");

}

}

Answer 1

keyboard.nextBoolean()只读取布尔值。现在当你继续阅读keyboard.nextLine()时，你会得到 Enter 键（这就是你正在谈论的跳过部分）。

在要求第二位买家后，您需要添加keyboard.nextLine();。

Answer 2

我认为nextBoolean()正在消耗布尔值，但是留下行尾字符，然后您的nextLine()将作为其输入消耗。因此，在要求第二个买家之前添加keyboard.nextLine()。

Answer 3

也许它没有跳过它，你在创建“它”时使用了错误的买家。仔细看看：

CarOrder state = new CarOrder(buyer1, car1, cost1, quantity1, tax1);
CarOrder it = new CarOrder(buyer1, car2, cost2, quantity2, tax2); // <-- This should be buyer2

我的程序跳过让用户输入一个变量的值

3 个答案: