java 判斷兩個(gè)時(shí)間段是否重疊的案例

package com.abc.common.util;

import lombok.Data;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;

/**
 * 日期工具類
 * <p>
 *   使用LocalDateTime存取或判斷
 * </p>
 * @see java.time.LocalDateTime
 * @date 2020-6-29 10:20:42
 */
@Component
public class DateUtil {

  /**
   * 判斷兩個(gè)時(shí)間段是否重疊
   * @param slot1
   * @param slot2
   * @return
   */
  public static boolean overlapped(TimeSlot slot1, TimeSlot slot2) {
    TimeSlot previous, next;
    previous = slot1.startTime.isBefore(slot2.startTime) ? slot1 : slot2;
    next = slot2.startTime.isAfter(slot1.startTime) ? slot2 : slot1;
    // 這里業(yè)務(wù)需要，允許時(shí)間點(diǎn)的重疊
    // 例如某個(gè)時(shí)間段的起始時(shí)間：2020-06-29 00:00:00
    // 和另一個(gè)時(shí)間段的終止時(shí)間：2020-06-29 00:00:00
    // 它們倆可以有交點(diǎn)。如果不需要這種邏輯只把le改成lt
    // ，ge改成gt就可
    return !(le(previous, next) || ge(previous, next));
  }

  /**
   * 構(gòu)造一個(gè)時(shí)間段
   * @param startTime
   * @param endTime
   * @return
   */
  public static TimeSlot buildSlot(LocalDateTime startTime, LocalDateTime endTime) {
    return new TimeSlot(startTime, endTime);
  }

  /**
   * less equal
   * 小于等于
   * @param prev
   * @param next
   * @return
   */
  private static boolean le(TimeSlot prev, TimeSlot next) {
    return lt(prev, next) || next.endTime.isEqual(prev.startTime);
  }

  /**
   * greater equal
   * 大于等于
   * @param prev
   * @param next
   * @return
   */
  private static boolean ge(TimeSlot prev, TimeSlot next) {
    return gt(prev, next) || prev.endTime.isEqual(next.startTime);
  }

  /**
   * greater than
   * 大于
   * @param prev
   * @param next
   * @return
   */
  private static boolean gt(TimeSlot prev, TimeSlot next) {
    return prev.endTime.isBefore(next.startTime);
  }

  /**
   * less than
   * 小于
   * @param prev
   * @param next
   * @return
   */
  private static boolean lt(TimeSlot prev, TimeSlot next) {
    return next.endTime.isBefore(prev.startTime);
  }

  /**
   * 時(shí)間段類
   */
  @Data
  static class TimeSlot{
    private LocalDateTime startTime;
    private LocalDateTime endTime;

    public TimeSlot(LocalDateTime startTime, LocalDateTime endTime) {
      if (startTime.isAfter(endTime)) {
        this.startTime = endTime;
        this.endTime = startTime;
      } else {
        this.startTime = startTime;
        this.endTime = endTime;
      }
    }
  }
}

// ...
 if (DateUtil.overlapped(
 DateUtil.buildSlot(beginTime, endTime),
 DateUtil.buildSlot(beginTime1, endTime1)
 )) {
 // 時(shí)間段有重疊，寫下重疊情況的業(yè)務(wù)代碼
 }
// ...

 public static String TimeDifference(long start, long end) {
 
    long between = end - start;
    long day = between / (24 * 60 * 60 * 1000);
    long hour = (between / (60 * 60 * 1000) - day * 24);
    long min = ((between / (60 * 1000)) - day * 24 * 60 - hour * 60);
    long s = (between / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
    long ms = (between - day * 24 * 60 * 60 * 1000 - hour * 60 * 60 * 1000
        - min * 60 * 1000 - s * 1000);
    String timeDifference = day + "天" + hour + "小時(shí)" + min + "分" + s + "秒" + ms
        + "毫秒";
    return timeDifference;
  }