Question

我正在使用enum / switch case以及Zeller的公式来说明具体日期的哪一天。我的代码是在我实现代码的enum / switch部分之前的正确日子打印的（下面）。在我输入enum / switch的情况下，当我在DrJava中运行它时，它会提示当天，月份和年份，但是一旦它通过开关盒就没有打印

 import java.util.*;

public class Zeller {

  public enum DaysOftheWeek {

    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY;
  }

  private static int value;



  public Zeller (int value){
    this.value = value;
  }
  public int getValue(){
    return this.value;
  }

    public static void main(String[] args) {
      DetermineDay(value);        // Create a Scanner
        Scanner input = new Scanner(System.in);

        // Prompt the user to enter a year, month and a day


        System.out.print("Enter month: 1-12: ");
        int month = input.nextInt();

        System.out.print("Enter the day of the month: 1-31: ");
        int day = input.nextInt();

        System.out.print("Enter year (e.g., 2008): ");
        int year = input.nextInt();

        // Check if the month is January or February
        // If the month is January and February, convert to 13, and 14,
        // and year has to -1. (Go to previous year).
        if (month == 1 || month == 2) {
            month += 12;
            year--;
        }

        // Compute the answer
        int k = year % 100; // The year of the century
        int j = (int)(year / 100.0); // the century
        int q = day;
        int m = month;
      int h = (q + (int)((13 * (m + 1)) / 5.0) + k + (int)(k / 4.0)

           + (int)(j / 4.0) + (5 * j)) % 7;
      value = h;

      System.out.println(value);

    }

    public static String DetermineDay(int value){

        String result = "Day of the week is "; 

    switch (value){

      case 1 :
        System.out.println(result + "Sunday");
        break;
      case 2 :
        System.out.println(result + "Monday"); 
        break;
      case 3:
      System.out.println(result + "Tuesday");
      break;
      case 4:
        System.out.println(result + "Wednesday");

        break;
      case 5:
        System.out.println(result + "Thursday"); 
        break;

      case 6:
        System.out.println(result + "Friday"); 
        break;
      case 7 :
        System.out.println( result + "Saturday");
        break;
      default : 
        System.out.println ("Looks like that day doesn't exist");
        break;
    }


   return result;     
  }
}

Answer 1

如果您想使用DetermineDay输出当天，则需要在完成计算后最后调用该方法，并将结果分配给值。
这似乎有效但你的算法在使用日期4/11/2016尝试这个程序时有问题它确实发现它是星期五，但是当使用日期5/5/2016这是今天的输出是 - 看起来像那天不存在，所以是的，那就是。

在DetermineDay结束时，你不需要返回一个结果，因为你已经在开关内输入了结果。

import java.util.*;

public class Zeller {
 public enum DaysOftheWeek {
  SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY;
 }

 private static int value;

 public Zeller (int value){
  this.value = value;
 }

 public int getValue(){
  return this.value;
 }

 public static void main(String[] args) {
  // Create a Scanner
  Scanner input = new Scanner(System.in);

  // Prompt the user to enter a year, month and a day
  System.out.print("Enter month: 1-12: ");
  int month = input.nextInt();

  System.out.print("Enter the day of the month: 1-31: ");
  int day = input.nextInt();

  System.out.print("Enter year (e.g., 2008): ");
  int year = input.nextInt();

  // Check if the month is January or February
  // If the month is January and February, convert to 13, and 14,
  // and year has to -1. (Go to previous year).
  if (month == 1 || month == 2) {
    month += 12;
    year--;
  }

  // Compute the answer
  int k = year % 100; // The year of the century
  int j = (int)(year / 100.0); // the century
  int q = day;
  int m = month;
  int h = (q + (int)((13 * (m + 1)) / 5.0) + k + (int)(k / 4.0) + (int)(j / 4.0) + (5 * j)) % 7;
  value = h;

  System.out.println(value);
  DetermineDay(value);
 }

 public static void DetermineDay(int value){
  String result = "Day of the week is "; 

  switch (value){
   case 1 :
    System.out.println(result + "Sunday");
    break;

    case 2 :
     System.out.println(result + "Monday"); 
     break;

    case 3:
     System.out.println(result + "Tuesday");
     break;

    case 4:
     System.out.println(result + "Wednesday");
     break;

    case 5:
     System.out.println(result + "Thursday"); 
     break;

    case 6:
     System.out.println(result + "Friday"); 
     break;

    case 7 :
     System.out.println( result + "Saturday");
     break;

    default : 
     System.out.println ("Looks like that day doesn't exist");
     break;
  }
 }
}

开关盒使用Java后输出不打印

1 个答案: