Question

我在这个日期转换程序上有点困惑。我试图让它从数字mm / dd / yy格式转换为标准的月/日/年格式。我确定它是一个我无法看到的简单修复。任何建议将不胜感激。

所以它应该运行这样的东西：

以mm dd yyyy：11 20 1981
的格式输入日期
您输入的日期是1981年11月20日。

输入另一个日期？（是/否）

package dateconverter;

import java.util.Scanner;

public class DateConverter {

public static void main(String[] args) {
    Scanner console = new Scanner(System.in);
    int monthValue;
    int dayValue;
    int yearValue;
    int[] daysOfMonth = {12, 31, 28, 31, 30, 31, 30, 31, 30, 31};
    final String[] monthNames
            = new String[]{"Jan", "Feb", "March", "April", "May",
                "Jun", "July", "Aug", "Sept", "Oct", "Nov", "Dec"};

    while (true) {
        // Gets date from the user.
        System.out.print("Enter a date in the format mm dd yyyy: ");
        monthValue = console.nextInt();
        dayValue = console.nextInt();
        yearValue = console.nextInt();

        // Examine the month, day, year. 
        // Value for the month, day, year that is entered.
        // If it is not the range of the accepted value, throw an exception.  

       try { // MonthException
           if (monthValue < 1 || monthValue > 12) 
              throw new MonthException();   
        }
           catch (MonthException e) {
             System.out.println(e.getMessage());
        }

       try { // Day Exception
           if (dayValue < 1 && dayValue > 31 )
               throw new DayException();
       }
           catch (DayException e) {
            System.out.println(e.getMessage());
        }

       try { // Year Exception
           if (yearValue <= 1000 && yearValue >= 3000)
               throw new YearException();
       }
           catch (YearException e) {
            System.out.println(e.getMessage());
       }
        try { // Leap Year
           if ((yearValue % 4 == 0) && (dayValue > 31)) 
               throw new DateException();
        }
           catch (DateException e) {
            System.out.println(e.getMessage());   
           }

        console.nextLine();  // To flush input buffer.
        System.out.print("Enter another date? (yes/no) ");
        String response = console.nextLine();
        if (!response.toUpperCase().equals("no")) {
            System.exit(0);

    }          
    }
}
private static class MonthException extends RuntimeException {

public MonthException() {
   super("Invalid month value entered, month exceeds excepted value."
           + "Please try again.");
    }
    }

private static class DateException extends RuntimeException {

public DateException() {
    super("Entered date is a leap year.");
    }
}
}

class YearException extends RuntimeException {

public YearException() {
    super("Values between 1000 and 3000 are only allowed,"
            + " Please try again.");
    }
}
 class DayException extends RuntimeException {

 public DayException() {
     super("Invalid day value entered, only accept values between 1 and 31."
             + " Please try again.");
    }
}

Answer 1

private String getFormatedDate(String date) {
    SimpleDateFormat sf = new SimpleDateFormat("MM/dd/yyyy");
    SimpleDateFormat sfFormate = new SimpleDateFormat("MMM/dd/yyyy");
    try {
        return sfFormate.format(sf.parse(date))+ "";
    } catch (ParseException e) {
        e.printStackTrace();
        return "";
    }

}

并将此功能称为

getFormatedDate("11/19/2014");

如果它适合你，请标记为。

无法获取我的日期转换程序以打印转换

1 个答案: