Sort Procedure First sort by the delivered date & in case of multiple records on same date sort by delivered time (Note: if a record has both ordered and Delivered Date ,it should be sorted by Delivered date only)
08-JUN: 03.00, 08-JUN: 04.00
Then look at the ordered date without delivered date which also exists for 08-JUN & sort by ordered date if multiple records on same date sort by ordered time
08-JUN: 02.00
Then go back to the next delivered date & in case of multiple records sort by delivered time
09-JUN: 01.00, 09-JUN: 12.00
Then look at the ordered date without delivered date which also exists for 09-JUN & sort by ordered date if multiple records on same date sort by ordered time
09-JUN: 14.00
**ordered date** **orderTime** **DeliveredDate** **DeliveredTime**
24-NOV-2021 10.00 24-NOV-2021 12.00
- - 24-NOV-2021 09.00
25-NOV-2021 9.00 - -
25-NOV-2021 11.00 26-NOV-2021 12.00
25-NOV-2021 10.00 - -
26-NOV-2021 02.00 - -
- - 10-DEC-2021 03.00
- - 10-DEC-2021 02.00
26-NOV-2021 04.00 - -
27-NOV-2021 07.00
30-NOV-2021 08.00 - -
28-NOV-2021 12.00
27-NOV-2021 14.00 - -
//Output should be like the following .-> ordered date orderTime DeliveredDate DeliveredTime
- - 24-NOV-2021 09.00
24-NOV-2021 10.00 24-NOV-2021 12.00
25-NOV-2021 9.00 - -
25-NOV-2021 11.00 26-NOV-2021 12.00
26-NOV-2021 02.00
26-NOV-2021 04.00 - -
27-NOV-2021 07.00 - -
27-NOV-2021 14.00 - -
28-NOV-2021 12.00 - -
30-NOV-2021 08.00 - -
- - 10-DEC-2021 03.00
- - 10-DEC-2021 02.00
//The code I tried.not giving exp OP. any other way ?.->
int compareVal;
if(o1.getDeliveredDate() != null && o2.getDeliveredDate()!=null){
compareValue = (o1.getDeliveredDate().compareTo(o2.getDeliveredDate()));
if (compareValue == 0 && o1.getDeliveredTime() != null && o2.getDeliveredTime() != null) {
return (o1.getDeliveredTime().compareTo(o2.getDeliveredTime()));
}
return comparevalue;
} else if(o1.getDeliveredDate() != null & && o2.getDeliveredDate()==null) {
compareValue = (o1.getDeliveredDate().compareTo(o2.getOrderedDate()));
if (compareValue == 0 ) {
return -1;
}
return comparevalue;
} else if(o1.getDeliveredDate() == null & && o2.getDeliveredDate()!=null) {
compareValue = (o2.getDeliveredDate().compareTo(o1.getOrderedDate()));
if (compareValue == 0 ) {
return 1;
}
return comparevalue;
} else if(o1.getDeliveredDate() == null && o2.getDeliveredDate()==null &&
o1.getOrderedDate() != null && o2.getOrderedDate()!=null) {
compareValue = (o1.getOrderedDate().compareTo(o2.getOrderedDate()));
if (compareValue == 0 && o1.getOrderedTime() != null && o2.getOrderedTime() != null) {
return (o1.getOrderedTime().compareTo(o2.getOrderedTime()));
}
}
return compareVal;
CodePudding user response：
In your output, the last two must be reversed. Here's the corrected comparison order. It assumes time will be present when date is there.
if (o1.getOrderedDate() != null && o2.getOrderedDate() != null) {
compareValue = (o1.getOrderedDate().compareTo(o2.getOrderedDate()));
if (compareValue == 0) {
return o1.getOrderedTime().compareTo(o2.getOrderedTime());
}
return compareValue;
} else if (o1.getDeliveredDate() != null && o2.getDeliveredDate() != null) {
compareValue = (o1.getDeliveredDate().compareTo(o2.getDeliveredDate()));
if (compareValue == 0) {
return o1.getDeliveredTime().compareTo(o2.getDeliveredTime());
}
return compareValue;
} else if (o1.getDeliveredDate() == null && o2.getOrderedDate() == null) {
compareValue = (o1.getOrderedDate().compareTo(o2.getDeliveredDate()));
if (compareValue == 0) {
return o1.getOrderedTime().compareTo(o2.getDeliveredTime());
}
return compareValue;
} else {
compareValue = (o1.getDeliveredDate().compareTo(o2.getOrderedDate()));
if (compareValue == 0) {
return o1.getDeliveredTime().compareTo(o2.getOrderedTime());
}
return compareValue;
}
Note: For comparing two time values, you shouldn't rely on String's natural ordering. For example: It considers 11 < 9. If you always have 0 prefixed for hours 0 to 9, then you are good.
Another simpler way
In essence, you want to compare two Date/time from two objects (let me call it MyDateTime as the class name) i.e., given two MyDateTime instances, you want to pick the date and time of order - if not present, pick the date and time of delivery otherwise.
Once you have a date and time pair (either order/delivery) compare them with the other date and time pair of some other MyDateTime instance.
Let me define two helper functions for getting the Date and Integer objects to be used for comparison.
private static Date getDateForComparison(MyDateTime myDateTime) {
if (myDateTime.getOrderedDate() != null) {
return myDateTime.getOrderedDate();
}
return myDateTime.getDeliveredDate();
}
private static String getTimeForComparison(MyDateTime myDateTime) {
if (myDateTime.getOrderedTime() != null) {
return myDateTime.getOrderedTime();
}
return myDateTime.getDeliveredTime();
}
Then, we can write a simple comparator as:
Comparator<MyDateTime> comparator = Comparator.comparing(MyDateTime::getDateForComparison)
.thenComparing(MyDateTime::getTimeForComparison);
P.S: Java Date class is not recommended and must be treated as deprecated. Check on the Java 8 alternate for it.