请教一个算法问题

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请教一个算法问题0

计算一下当前时间到周三中午12点还有多少时长?
哪位帮忙给写个伪代码,

算法

2014年9月07日 10:18

liyu212
2
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1个答案按时间排序按投票排序

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采纳的答案

package com.kuke.update.timmer;

import java.util.Calendar;
import java.util.Date;
import java.util.TimerTask;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;



/**
 * 定时任务
 * 用于定时提交索引、定时刷新搜索词缓存
 */
public class ScheduledExceutor extends TimerTask {
	
	
	private String jobName = "";

	private static ScheduledExecutorService service = Executors.newScheduledThreadPool(2);

	public ScheduledExceutor(String jobName) {
		super();
		this.jobName = jobName;
	}

	@Override
	public void run() {
		
	}

	
	/**
	 * 计算从当前时间currentDate开始，满足条件dayOfWeek, hourOfDay, minuteOfHour,
	 * secondOfMinite的最近时间
	 */
	public Calendar getEarliestDate(Calendar currentDate, int dayOfWeek, int hourOfDay, int minuteOfHour, int secondOfMinite) {
		// 计算当前时间的WEEK_OF_YEAR,DAY_OF_WEEK, HOUR_OF_DAY, MINUTE,SECOND等各个字段值
		int currentWeekOfYear = currentDate.get(Calendar.WEEK_OF_YEAR);
		int currentDayOfWeek = currentDate.get(Calendar.DAY_OF_WEEK);
		int currentHour = currentDate.get(Calendar.HOUR_OF_DAY);
		int currentMinute = currentDate.get(Calendar.MINUTE);
		int currentSecond = currentDate.get(Calendar.SECOND);

		// 如果输入条件中的dayOfWeek小于当前日期的dayOfWeek,则WEEK_OF_YEAR需要推迟一周
		boolean weekLater = false;
		if (dayOfWeek < currentDayOfWeek) {
			weekLater = true;
		} else if (dayOfWeek == currentDayOfWeek) {
			// 当输入条件与当前日期的dayOfWeek相等时，如果输入条件中的
			// hourOfDay小于当前日期的
			// currentHour，则WEEK_OF_YEAR需要推迟一周
			if (hourOfDay < currentHour) {
				weekLater = true;
			} else if (hourOfDay == currentHour) {
				// 当输入条件与当前日期的dayOfWeek, hourOfDay相等时，
				// 如果输入条件中的minuteOfHour小于当前日期的
				// currentMinute，则WEEK_OF_YEAR需要推迟一周
				if (minuteOfHour < currentMinute) {
					weekLater = true;
				} else if (minuteOfHour == currentSecond) {
					// 当输入条件与当前日期的dayOfWeek, hourOfDay，
					// minuteOfHour相等时，如果输入条件中的
					// secondOfMinite小于当前日期的currentSecond，
					// 则WEEK_OF_YEAR需要推迟一周
					if (secondOfMinite < currentSecond) {
						weekLater = true;
					}
				}
			}
		}
		if (weekLater) {
			// 设置当前日期中的WEEK_OF_YEAR为当前周推迟一周
			currentDate.set(Calendar.WEEK_OF_YEAR, currentWeekOfYear + 1);
		}
		// 设置当前日期中的DAY_OF_WEEK,HOUR_OF_DAY,MINUTE,SECOND为输入条件中的值。
		currentDate.set(Calendar.DAY_OF_WEEK, dayOfWeek);
		currentDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
		currentDate.set(Calendar.MINUTE, minuteOfHour);
		currentDate.set(Calendar.SECOND, secondOfMinite);
		return currentDate;

	}
	
	
	public static void main(String[] args) { 
		//每周3 、12点、0分、0秒执行 (sunday:1   作为一周第一天)
		int dayOfWeek_upindex = 4;
		int hourOfDay_upindex = 12;
		int minuteOfHour_upindex = 0;
		int secondOfMinite_upindex = 0;
		ScheduledExceutor job = new ScheduledExceutor("");
		Calendar currentDate = Calendar.getInstance();
		long currentDateLong = currentDate.getTime().getTime();
		Calendar earliestDate = job.getEarliestDate(currentDate, dayOfWeek_upindex, hourOfDay_upindex, minuteOfHour_upindex,
				secondOfMinite_upindex);
		long earliestDateLong = earliestDate.getTime().getTime();
		// 计算从当前时间到最近一次执行时间的时间间隔
		long delay = earliestDateLong - currentDateLong;
		System.out.println(delay);
		
//		long period = 7 * 24 * 60 * 60 * 1000;
//		service.scheduleAtFixedRate(job, delay, period, TimeUnit.MILLISECONDS);
		
	}
	
	
	
}

2014年9月09日 10:01