Java 如何将在if语句中设置的变量带入代码的其余部分？

在我打印出目的地和酒店的底部，它表示本地变量没有初始化。如何获取代码，以便在if语句中分配给这些变量的值一直保留到底部？

初始化变量。例如，改变

import java.util.Scanner;

public class TripCost 
{
  public static void main(String[] args)
  {
    Scanner keyboard = new Scanner(System.in);
    String destination;
    String hotel;
    int days = 3;
    double mealCost;
    double regularMeal = 31.00;
    double highCostMeal = 52.00;
    double gasPrice = 3.29;
    double miles;
    double airfare;
    double hotelCost;
    double budgetel = 76.00;
    double holidayInn = 109.00;
    double sheraton = 138.00;
    double hyatt = 215.00;

    System.out.println("Here are the places you may go for vacation:");
    System.out.println("--------------------------------------------");
    System.out.println(" 1. Niagra Falls");
    System.out.println(" 2. Chicago");
    System.out.println(" 3. San Francisco");
    System.out.println(" 4. Las Vegas");
    System.out.println(" 5. St. Louis");
    System.out.println("--------------------------------------------");
    System.out.print("Please select the number of the destination: ");
    int destinationChoice = keyboard.nextInt();


    if (destinationChoice == 1)
    {
        miles = 257.00;
        airfare = 0;
        mealCost = regularMeal;
        destination = "Niagra Falls"; 
    }
    else if (destinationChoice == 2)
    {
        miles = 303.00;
        airfare = 0;
        mealCost = highCostMeal;
        destination = "Chicago";
    }
    else if (destinationChoice == 3)
    {
        miles = 0;
        airfare = 630.00;
        mealCost = highCostMeal;
        destination = "San Francisco";
    }
    else if (destinationChoice == 4)
    {
        miles = 0;
        airfare = 415.00;
        mealCost = highCostMeal;
        destination = "Las Vegas";
    }
    else if (destinationChoice == 5)
    {
        mealCost = regularMeal;
        destination = "St. Louis";
        System.out.print("Would you like to drive or fly? ");
        String transportation = keyboard.next();
        if (transportation.equalsIgnoreCase("drive"))
        {
            miles = 551.00;
            airfare = 0;
        }
        else if (transportation.equalsIgnoreCase("fly"))
        {
            miles = 0;
            airfare = 290.00;
        }
        else
        {
            System.out.print("Invalid selection");
            System.exit(1);
        }
    }
    else
    {
        System.out.print("Invalid destination");
        System.exit(1);
    }

    System.out.println("These are the hotels with vacancies:");
    System.out.println("------------------------------------");
    System.out.printf("%-15s%10s%.0f\n", "1. Budgetel", "$", budgetel);
    System.out.printf("%-15s%10s%.0f\n", "2. Holiday Inn", "$", holidayInn);
    System.out.printf("%-15s%10s%.0f\n", "3. Sheraton", "$", sheraton);
    System.out.printf("%-15s%10s%.0f\n", "4. Hyatt", "$", hyatt);
    System.out.println("------------------------------------");
    System.out.print("Which hotel would you like to stay at? ");
    int hotelChoice = keyboard.nextInt();
    if (hotelChoice == 1)
    {
        hotelCost = budgetel;
        hotel = "Budgetel";
    }
    else if (hotelChoice == 2)
    {
        hotelCost = holidayInn;
        hotel = "Holiday Inn";
    }
    else if (hotelChoice == 3)
    {
        hotelCost = sheraton;
        hotel = "Sheraton";
    }
    else if (hotelChoice == 4)
    {
        hotelCost = hyatt;
        hotel = "Hyatt";
    }
    else
    {
        System.out.print("Invalid selection");
        System.exit(1);
    }

    System.out.println("Cost for your trip (drive to " + destination + ", staying at " + hotel + " for " + days + " days):");
    System.out.println("---------------------------------------------------");
    System.out.printf("%-13s%1s%3s%3.2f\n", "Transportation", ":", "$", miles/gasPrice);
}
}

到

---

其他所有未初始化的变量也是如此。

如果字符串变量未初始化，则该变量将为空值，因此需要初始化它的值，然后当该变量通过if语句时，将获得正确的结果值，您可以声明String hotel=“”；例如希望能帮忙

非常感谢！这似乎是一个重要的警告，我们的讲师应该提到这一点，您认为自己很幸运，因为您使用的是Java，编译器指出了这个编程错误；例如，如果你使用C++，你会发现，直到程序开始崩溃，因为神秘的原因！是的，感谢上帝让我们日食。我不能说我犯了多少次愚蠢的语法错误，eclipse说“嘿，不要那样做”很抱歉最初没有标记正确，我对这个网站不熟悉。我帮你纠正了！

String destination;

String destination = null;