問題描述

我在將字符串日期解析為 Date 對象時遇到了一些麻煩.我使用 DateFormat 來解析字符串，當我打印日期的值時，它給出了我所期望的.

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.

但是當我嘗試獲取日期、月份或年份時，它給了我錯誤的值.例如，年份是 2011 年，但是當我執行 .getYear() 時，它給了我 111.我不知道為什么會這樣.以下是相關代碼段:

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();
    }

當我輸出 dateFrom 時，我得到 Sun Dec 04 00:00:00 GMT 2011，這是您所期望的.但是打印 .getYear() 會返回 111.

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.

我需要能夠為時間序列圖獲取日期的日、月和年.

I need to be able to get the day, month and year of the date for a time series graph.

推薦答案

這些方法已棄用.相反，請使用 Calendar 類.

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();
         }
    }
}

輸出:

Year = 2011
Month = 3
Day = 12

<小時>

對于 month 字段，這是從 0 開始的.這意味著一月 = 0 和十二月 = 11.正如 javadoc 所述,

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

get 和 set 的字段編號，表示月份.這是一個特定于日歷的值.公歷一年的第一個月而儒略歷是JANUARY，即0；最后取決于一年中的月數.

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.

這篇關于為什么 Java 的 Date.getYear() 返回 111 而不是 2011?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！