Java 重复局部变量n

我一直在尝试用java解决一个问题，并试图寻找答案。 我找不到任何东西，除了我可能已经声明了一个变量两次，我不知道在哪里

我试图获得用户输入，一个整数“n”，作为瓶子的起始数量。 请帮助并告诉我如何更改和修复此问题

以下是我的代码部分：

public class BottlesOfBeer {

    private static Scanner bottles;
    public static void number(int n) {
        bottles = new Scanner(System. in );
        bottles.useDelimiter("\n");

        System.out.println("Enter the starting number of " + "bottles in the song " + "'99 Bottles of Beer on the Wall':");
        int n = bottles.nextInt();

        if (n > 1) {
            System.out.print(n + " bottles of beer on the wall, " + n + " bottles of beer, ya' take one down, " +
                "ya' pass it around, ");
            n = n - 1;
            System.out.println(n + " bottles of beer on the wall.");
            number(n);
        } else {

            if (n == 1) {
                System.out.print(n + " bottle of beer on the wall, " + n + " bottle of beer, ya' take one down, " +
                    "ya' pass it around, ");
                n = n - 1;
                System.out.println(n + " bottles of beer on the wall.");
                number(n);
            } else {
                System.out.println("No more bottles of beer on the wall, " +
                    "no bottles of beer, ya' can't take one down, " + "ya' can't pass it around, 'cause there are" + " no more bottles of beer on the wall!");
            }

        }
    }

---

在

number

方法的签名中既有参数

n

，也有方法中定义的变量

n

。由于编译器无法区分这两者，因此必须重命名其中一个

public static void number(int n) { // first n
    bottles = new Scanner(System.in);
    bottles.useDelimiter("\n");

        System.out.println("Enter the starting number of " 
                + "bottles in the song "
                + "'99 Bottles of Beer on the Wall':");
        int n = bottles.nextInt(); // second n

---

不允许在同一范围内声明多个同名变量。在代码中，您已经在名为number的方法中声明了两次名为'n'的变量。因为这两个变量在同一个方法作用域中，所以当您试图引用变量“n”时，编译器无法决定引用哪个变量

请注意，可以声明多个具有相同名称的变量，只要它们位于不同的作用域中。例如，以下是允许的

public class VariableScope {
    int scopedVar = 10; // First declaration
    public static void main(String[] args) {
            int scopedVar = 200; // Second declaration. 
                                 // This is perfectly valid. But it overrides the first declaration.

    }
}

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谢谢，我没有意识到我已经在参数中声明了n。我删除了n的第二个声明，它解决了我的问题。