请教一个算法问题

Question

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,

Answer 1

[code="java"]
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);

}

}
[/code]