无法获取已声明的字符串[重复]

Question

我无法打印已声明的字符串。以下是代码：

public class ignCalcu {

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

        System.out.println("Welcome to CalcuLegends!");
        while (true) {
            System.out.println("Before you use the Calcore, would you like to set an IGN first?");
            System.out.println("Yes or No?");
            String start = input.nextLine();
            if (start.equals("Yes") || start.equals("yes")){
                System.out.println("What is your favorite color?");
                String color = input.nextLine();
                System.out.println("What word describes you the best?");
                String word = input.nextLine();
                System.out.println("Think of an animal other than dog or cat.");
                String animal = input.nextLine();
                input.close();
         
                String ign = (" "+color+"_"+word+"_"+animal);
                System.out.println("Your IGN is" + ign );
                break;
            }
            else if (start.equals("No") || start.equals("no")){
                break;
            }
            else;
            System.out.println("Invalid response. Please try again.");
        }
        System.out.println("hi "+ ign + "!");
    }
}

下面是错误：

source_file.java:33: error: cannot find symbol
         System.out.println("hi "+ ign + "!");
                                   ^
  symbol:   variable ign
  location: class ignCalcu
1 error

Answer 1

你超出了范围。如果不想在循环外访问ign，则需要在循环外声明它。

Java范围

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

        System.out.println("Welcome to CalcuLegends!");
        
        while (true){
            ...

            ign = (" " + color + "_"  + word + "_" + animal);
        }
        
        System.out.println("hi "+ ign + "!");
}