`DayOfWeek`枚举

Question

我想知道是否有人可以告诉我，在输入6个产品或/和6个数量输入后，是否可以循环一周中的几天。所以基本上程序显示星期一然后循环6次然后循环到星期二循环6次然后星期三。如果有可能我可以得到一些想法???我真的很感激一些帮助。我用谷歌搜索没有运气，因为我知道我并没有向谷歌提出正确的问题。

 import java.util.Scanner;

      public class Mailorder {

         public static void main(String[] args) {

         //create a scanner
         Scanner input = new Scanner(System.in);

         //declare variables

         double product1 = 3.75;
         double product2 = 5.95;
         double product3 = 8.75;
         double product4 = 6.92;
         double product5 = 8.75;
         double product6 = 7.87;
         double sum2 = 0;
         int sum1 = 0;
         double total = 0.00;
         int product;
         int quantity;

         //Monday
         System.out.print("Monday");
         System.out.println();

         //read in product # 
         System.out.print("Enter a product number: ");
         product = input.nextInt();

         //read in quantity sold
         System.out.print("Enter quantity sold: ");
         quantity = input.nextInt();


         //keep reading data until the input is 0
         while (quantity != -1) {
                 sum1 += quantity;

         //switch case
         switch (product) 
        {
         case 1: total = product1 * quantity; break;
         case 2: total = product2 * quantity; break;
         case 3: total = product3 * quantity; break;
         case 4: total = product4 * quantity; break;
         case 5: total = product5 * quantity; break;
         case 6: total = product6 * quantity; break;
        }

       sum2 +=total;

       //read the next data 
       System.out.print("Enter a product number: ");
             product = input.nextInt();

       System.out.print("Enter quantity sold: ");
             quantity = input.nextInt();

        }   
      //print results
      System.out.println("The total retail value of all products sold last week $" + sum2);

    }
  }

Answer 1

使用内循环：

for(--- each day of the week ---) 
    // do something

    for(int i=0; i<6; i++) {
        // do something else
    }
}

要查找一周中的几天（如何实现第一个循环），请查看课程日历：https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#getActualMinimum(int)

int firstDay = Calendar.getInstance().getActualMinimum(Calendar.DAY_OF_WEEK);
int lastDay = Calendar.getInstance().getActualMaximum(Calendar.DAY_OF_WEEK);

Answer 2

`DayOfWeek`枚举

DayOfWeek枚举定义七个对象，一周中的每一天，周一至周日编号为1-7。

EnumSet是Set的高度优化实现，用于收集枚举对象。

EnumSet<DayOfWeek> dows = EnumSet.allOf( DayOfWeek.class );  // Collect all seven day-of-week objects, in order Monday-Sunday.

循环设定。

for( DayOfWeek dow : dows ) {
    String dowName = dow.getDisplayName( TextStyle.FULL , Locale.US ) ;  // Generate localized string for the name of the day-of-week.
    System.out.println( dowName ) ;  
    … // Ask for product code and do your math
}

Answer 3

对于未格式化的文字，我很抱歉，我正在通过手机回复。

我认为你需要的是这个运算符＆＃34;％＆＃34;

在while循环中，您可以增加计数

int count=0;
String currentDay="Monday";
String nextDay;


// your while loop start here

count++;

if(count%6 == 0)
{
    switch(currentDay)
    {
    case "Monday": nextDay="Tuesday"; break;
    //etc
    }
currentDay = nextDay;
}

％运营商会给你提醒分组。

Answer 4

DayOfWeek枚举

DayOfWeek枚举定义了七个对象，一周中的每一天，周一至周日编号为1-7，可以更轻松地访问：

for(DayOfWeek day : DayOfWeek.values())
{
   //Your code goes here
}

循环一周的日子

4 个答案:

`DayOfWeek`枚举