Question

我收到了几个“错位的构造”错误和“删除令牌”错误。 Oracle网站上对这些错误的描述非常模糊。我无法弄清楚问题是什么，但似乎我有一个不合适的括号抛出整个程序。谁能看到我做错了什么？

public class divisorCalc2 {
    import java.util.Scanner; //Imports scanner class

    public static int gcd(int num1, int num2) {
        if (num2 == 0) {
            return num1;
        } else {    
            return gcd(num2, num1 % num2);
        }
    }

    public static void main(String[] args) {
        System.out.println("Please enter first integer:");
        int firstInt = in.nextInt();

        System.out.println("Please enter second integer:");
        int secondInt = in.nextInt();

        System.out.println(gcd(firstInt,secondInt));

        in.close(); //Closes Scanner
    }
}

Answer 1

你不能在另一个方法中使用方法。把整个gcd代码放在main之外。

main (...){
  ...
}

gcd (...){
  ...
}

Answer 2

You have a method inside another, move it outside main method, you don't have a scanner declared too, you imported the scanner class but is not defined yet.

Here:

   public static int gcd(int num1, int num2) {
        if (num2 == 0) {
            return num1;
        } else {
            return gcd(num2, num1 % num2);
        }
    }

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        System.out.println("Please enter first integer:");
        int firstInt = input.nextInt();

        System.out.println("Please enter second integer:");
        int secondInt = input.nextInt();

        System.out.println(gcd(firstInt, secondInt));

        input.close(); //Closes Scanner
    }

Answer 3

In a class definition, package declaration is first line, any import(s) is second line. Next comes the 'public class ...'. Your program fails here itself. Take imports statement above, immediate after package.

错位的构造

3 个答案: