There is no crossover in the time period within 24 hours

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Code

2:00 - 4:00 6:00- 8:00

The idea is to turn these into dates lcoalDateTime Compare , This is the idea , The code is not tested .

 	/** *  Determine whether   Whether the time period repeats ,  Overlapped return  false ,  No overlapping returns true * @Param startTime  Enter the start time  * @Param endTime  End time of output  * @Param isStartTime  Start time of comparison  * @Param isEndTime  End time of comparison  * */
    public static boolean isOverlap(String startTime, String endTime , String isStartTime, String isEndTime  ){
    

        // add prefix  yyyy-MM-dd
        String frontTime1 = "1970-01-01";
        String frontTime2 = "1970-01-02";


        startTime = frontTime1 +" "+startTime;   // 197-01-01 23:00
        // Description is a yes   stay 00 Before the point ,, In a 00 After the point   such as  23：00 - 3：00
        if(startTime.compareTo(endTime) > 0 ){
    
            endTime = frontTime2 + " " + endTime;
        }else{
    
            endTime = frontTime1 + " " + endTime;
        }

        isStartTime = frontTime1 +" "+isStartTime;
        if(isStartTime.compareTo(isEndTime) > 0 ){
    
            isEndTime = frontTime2 + " " + isEndTime;
        }else{
    
            isEndTime = frontTime1 + " " + isEndTime;
        }

        // String rotation localdateTime
        LocalDateTime localStartTime= LocalDateTime.parse(startTime, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        LocalDateTime localEndTime= LocalDateTime.parse(endTime, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        LocalDateTime localIsStartTime= LocalDateTime.parse(isStartTime, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        LocalDateTime localIsEndTime= LocalDateTime.parse(isEndTime, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));

        // No, 00 The difference between the  3：00 -8：00 4:00-6:00 3：00 -8：00 2:00-6:00 2:00-9:00 8:00 -5:00
        // start < end isStart< end
        if(        (  localEndTime.isEqual(localIsStartTime) || localEndTime.isBefore(localIsStartTime) )
                && (  localStartTime.plusDays(1).isAfter(localIsEndTime)         )   //  Make sure not to exceed 24 Hours 
        ){
        //  situation 1 ： 3：00 -8：00 8:00-9:00
            return true;
        }else if(  ( localIsEndTime.isEqual(localStartTime) || localIsEndTime.isBefore(localStartTime) )
                && (  localIsStartTime.plusDays(1).isAfter(localEndTime) )
        ){
      //9：00 -11：00 8:00-9:00
            return true;
        }else{
    
            return false;
        }

    }