java - 安卓/Java : Annual countodwn with having to update it constantly

Question

我想每年设置一个到年底的倒计时器，而不必更新年份值。在 javascript 中，要获取倒计时日期，它将是:

var date = new Date();
var deadline = ' December 31 ' + date.getFullYear();
var t = Date.parse( deadline ) - Date.parse( new Date() );

我如何在java中实现这个？(是的，我知道java和javascript没有关系，我只是在javascript中实现了它，但无法弄清楚java的情况，刚刚开始学习java......)

代码:

        Calendar endOfYear = Calendar.getInstance();
        endOfYear.setTime(new Date(0)); /* reset */
        endOfYear.set(Calendar.DAY_OF_MONTH, 31);
        endOfYear.set(Calendar.MONTH, 11);
        endOfYear.set(Calendar.YEAR, Calendar.getInstance().get(Calendar.YEAR));

        Calendar today = Calendar.getInstance();
        double t =  endOfYear.getTimeInMillis() - today.getTimeInMillis();

        double seconds = Math.floor( ( t / 1000 ) % 60 );
        double minutes = Math.floor( ( t / 1000 / 60 ) % 60 );
        double hours = Math.floor( (t / ( 1000 * 60 * 60 ) ) % 24 );
        double days = Math.floor( t / ( 1000 * 60 * 60 * 24 ) );

        System.out.printf(days + " days, " + hours + " hours, " + minutes + " minutes and " + seconds + " seconds\n");

输出:

03-24 18:16:05.177 1800-1800/com.ehlien.clevercash I/System.out: 282.0 days, 1.0 hours, 43.0 minutes and 54.0 seconds
03-24 18:16:06.180 1800-1800/com.ehlien.clevercash I/System.out: 282.0 days, 1.0 hours, 43.0 minutes and 53.0 seconds
03-24 18:16:07.182 1800-1800/com.ehlien.clevercash I/System.out: 282.0 days, 1.0 hours, 43.0 minutes and 52.0 seconds
03-24 18:16:08.184 1800-1800/com.ehlien.clevercash I/System.out: 282.0 days, 1.0 hours, 43.0 minutes and 51.0 seconds
03-24 18:16:09.187 1800-1800/com.ehlien.clevercash I/System.out: 282.0 days, 1.0 hours, 43.0 minutes and 50.0 seconds
03-24 18:16:10.190 1800-1800/com.ehlien.clevercash I/System.out: 282.0 days, 1.0 hours, 43.0 minutes and 49.0 seconds

但是还有 5 个小时的休息时间。应该是 6 小时的地方，却显示 1 小时...

Answer 1

你可以尝试这样的事情:

import java.util.Date;
import java.util.Calendar;

public class source {
    public static void main(String[] args) {
         Calendar endOfYear = Calendar.getInstance();
         endOfYear.setTime(new Date(0));
         endOfYear.set(Calendar.DAY_OF_MONTH, 31);
         endOfYear.set(Calendar.MONTH, 11);
         endOfYear.set(Calendar.YEAR, Calendar.getInstance().get(Calendar.YEAR));
         Calendar today = Calendar.getInstance();
         long t =  endOfYear.getTimeInMillis() - today.getTimeInMillis();
         long seconds =  ( t / 1000 ) % 60 ;
         long minutes =  ( t / 1000 / 60 ) % 60;
         long hours =  (t / ( 1000 * 60 * 60 ) ) % 24 ;
         long days = t / ( 1000 * 60 * 60 * 24 );
         System.out.printf(days + " days, " + hours + " hours, " + minutes + " minutes and " + seconds + " seconds\n");
    }
}

这将产生:

280 days, 18 hours, 47 minutes and 41 seconds