为什么Java的Date.getYear（）返回111而不是2011？ [英] Why does Java's Date.getYear() return 111 instead of 2011?

问题描述

我有一点麻烦解析字符串日期到日期对象。我使用 DateFormat 来解析字符串，当我打印日期的值，它给我我想要的。

但是当我尝试得到的一天，一个月或一年它给我错误的价值观。例如，年是2011年，但是当我做 .getYear（）它给我111.我不知道为什么这种情况发生。以下是相关代码段：

 日期dateFrom = null; 
 
 String gDFString = g.getDateFrom（）; 
 
 System.out.println（gDFString）; 
 
 DateFormat df = new SimpleDateFormat（dd / MM / yyyy）; 
 
 try {
 dateFrom = df.parse（04/12/2011）; 
 
 System.out.println（dateFrom）; 
 
 System.out.println（dateFrom.getYear（））; 
} catch（ParseException e）{
 e.printStackTrace（）; 
} 
  

当我打印 dateFrom ，我得到 Sun Dec 04 00:00:00 GMT 2011 ，这是你会期望的。但打印 .getYear（）返回 111 。

我需要能够得到时间序列图的日期，月份和年份。

解决方案

已被弃用。而应使用日历类。

---

  import java.text.DateFormat; 
 import java.text.ParseException; 
 import java.text.SimpleDateFormat; 
 import java.util.Calendar; 
 
 public final class DateParseDemo {
 public static void main（String [] args）{
 final DateFormat df = new SimpleDateFormat（MM / dd / yyyy）; 
 final Calendar c = Calendar.getInstance（）; 
 try {
 c.setTime（df.parse（04/12/2011））; 
 System.out.println（Year =+ c.get（Calendar.YEAR））; 
 System.out.println（Month =+（c.get（Calendar.MONTH）））; 
 System.out.println（Day =+ c.get（Calendar.DAY_OF_MONTH））; 
} 
 catch（ParseException e）{
 e.printStackTrace（）; 
} 
} 
} 
  

strong>：

  Year = 2011 
 Month = 3 
 Day = 12 
  
 
 
 
 
 
 
至于月份 0为基础。这意味着January = 0和December = 11.如 javadoc所述，
 
 
获取和设置的字段号，表示月份。这是一个
特定于日历的值。一年中第一个月的
和Julian日历是 JANUARY 这是 0 ;最后一个取决于
一年中的月数。
 
 
 
I am having a bit of trouble parsing a string date to a Date object. I use a DateFormat to parse the string, and when I print the value of the date, it gives me what I expect.

But when I try get the day, the month or the year it gives me the wrong values. For instance, the year is 2011, but when I do .getYear() it gives me 111. I have no idea why this is happening. Here is the relevant code segment:
    Date dateFrom = null;

    String gDFString = g.getDateFrom();

    System.out.println(gDFString);

    DateFormat df = new SimpleDateFormat("dd/MM/yyyy");

    try {
        dateFrom = df.parse("04/12/2011");

        System.out.println(dateFrom);

        System.out.println(dateFrom.getYear());
    } catch (ParseException e) {
        e.printStackTrace();
    }
When I out print dateFrom, I get Sun Dec 04 00:00:00 GMT 2011, which is what you would expect. But printing .getYear() returns 111.

I need to be able to get the day, month and year of the date for a time series graph.
解决方案
Those methods have been deprecated. Instead, use the Calendar class. 



import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public final class DateParseDemo {
    public static void main(String[] args){
         final DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
         final Calendar c = Calendar.getInstance();
         try {
             c.setTime(df.parse("04/12/2011"));
             System.out.println("Year = " + c.get(Calendar.YEAR));
             System.out.println("Month = " + (c.get(Calendar.MONTH)));
             System.out.println("Day = " + c.get(Calendar.DAY_OF_MONTH));
         } 
         catch (ParseException e) {
             e.printStackTrace();
         }
    }
}
Output:
Year = 2011
Month = 3
Day = 12




And as for the month field, this is 0-based. This means that January = 0 and December = 11. As stated by the javadoc, 

  
Field number for get and set indicating the month. This is a
  calendar-specific value. The first month of the year in the Gregorian
  and Julian calendars is JANUARY which is 0; the last depends on the
  number of months in a year.


                        
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