什么是错误的这个代码我只是没有编译,它是在周二到期,请告诉我

Question

public enum Quarter
{
   FIRST,
   SECOND,
   THIRD,
   FOURTH,
}

  import java.util.*;



public class Quarterly
{

        private final int ROW = 6;
        private final int COL = 4;
        private Scanner _scanner;

我想知道如果我在这里适当地宣布我的扫描仪类,我在教科书中看到了这一点,但我不确定它是否有效？还有另一种方式可以写这个吗？

    public Quarterly(Scanner scanner)
    {
        this._scanner = scanner;
    }

这种方法没有正确编译它有什么问题？它显示三个错误

方法的标题显示编译错误"错误:找不到符号"

这两个错误都出现在我的四个案例陈述中

Error #1 : "an enum switch case label must be the unqualified name of the numeric constant.
Error #2: " Duplicate case label.

``

    private string GetMessage(Quarter quarter, int departmentNumber)// This shows an error that says " Error: Cannot Find Symbol"
    {
        // This case Statement is showing Two compiling errors that in every case just cannot find a way to fix them. 

        switch(quarter)
        {
            // Both These Errors are showing in all of my four case statement
            // Error #1 : "an enum switch case label must be the unqualified name of the numeric constant"
            // Error #2: " Duplicate case label.
            case Quarter.FIRST:
            return "Enter The First Quarterly Sales For Department [ " + departmentNumber+" ]. . . . . $ ";
            case Quarter.SECOND:
            return "Enter a The Second Quarterly Sales For Department [ " + departmentNumber+" ]. . . . . $ ";
            case Quarter.THIRD:
            return "Enter a The Third Quarterly Sales For Department [ " + departmentNumber+" ]. . . . . $ ";
            case Quarter.FORTH:
            return "Enter a The Forth Quarterly Sales For Department [ " + departmentNumber+" ]. . . . . $ ";

        }
    }

这是一个方法,它将输入分配给我的数组并总结,任何人都可以查看这个方法,看看他们是否看到我编译时可能出现的任何错误.

    public double GetTotalForDepartments(Quarter quarter)
    {
            double [][] sales = new double [ROW][COL];
            int num = 1;
            double total = 0;

            for (int row = 0; row < ROW ; row++)
            {

                for (int col = 0; col < COL; col++)
                {

                    // This will input value into my array
                    sales[row][col] = _scanner.nextDouble();
                    num++;

                    // This will Total my array
                    for (int i = 0; i < sales.length; i++);
                    {
                        total += sales[row][col];
                    }
                }

                return total;
            }

    }
}

这将是我的主要.这是我从我的班级调用我的所有方法.

public static void main(String[] args)
 {
     double test1;
     double test2;
     double test3;
     double test4;

 Scanner  keyboard = new Scanner(System.in);
 Quarterly helper = new Quarterly(keyboard);

 test1 = helper.GetTotalForDepartments(Quarter.FIRST);
 System.out.println(" Test 1 = " + test1);

 test2 = helper.GetTotalForDepartments(Quarter.SECOND);
 System.out.println(" Test 2 = " + test2);

 test3 = helper.GetTotalForDepartments(Quarter.THIRD);
 System.out.println(" Test 3 = " + test3);

 test4 = helper.GetTotalForDepartments(Quarter.FOURTH);
 System.out.println(" Test 4 = " + test4 " /n ");

}

Answer 1

你不是在switch语句中写入类型,也不是.编译器已经知道你在说什么类型.更换

case Quarter.FIRST:

同

case FIRST: