错误:找不到或加载主类计算器.Calculator /home/kubuntu/.cache/netbeans/8.2/

Question

我的完整代码：

import java.util.*;
public class Calculator {
    public static void main(String[] args) {
       double n1, n2;
       String operation;
        Scanner scan = new Scanner(System.in);
            System.out.println("Enter the first number: ");
            n1 = scan.nextDouble();
            System.out.println("Enter second number: ");
            n2 = scan.nextDouble();
            Scanner op = new Scanner(System.in);
            System.out.println("Enter +,-,/: ");
            operation = op.next();
            switch (operation)  {
                case "+":
                    System.out.println("Your answer is " + (n1 + n2));
                    break;
                case "-":
                    System.out.println("Your answer is " + (n1 - n2));
                    break;
                case "/":
                    System.out.println("Your answer is " + (n1 / n2));
                    break;
                 case "*":
                    System.out.println("Your answer is " + (n1 * n2));
                    break;
                 default: 
                     System.out.println("You are finished");         
       } 
    } 
}

我目前正在尝试创建一个计算器。如果有人能够提供帮助，将不胜感激。(如果您也可以添加简单的评论，那也很棒(

Answer 1

您缺少一个运算符:)

Scanner scan = new Scanner(System.in);

那对我来说效果很好。