CODEWITHSUNDEEP
javasortingdatejodatime
user1950349
user1950349

Reputation: 5146

How to get start and end range from list of timestamps?

I have a timestamp string like this:

2016-01-14T22:43:55Z
2016-01-15T00:04:50Z
2016-01-15T00:44:59+08:30
2016-01-15T01:25:35-05:00
2016-01-15T01:44:31+08:30
2016-01-15T02:22:45-05:00
2016-01-15T02:54:18-05:00
2016-01-15T03:53:26-05:00
2016-01-15T04:32:24-08:00
2016-01-15T06:31:32Z
2016-01-15T07:06:07-05:00

I want to sort them so that I can get what is starting range and ending range from above timestamp. I am doing like below:

List<String> timestamp = new ArrayList<>();
// adding above string timestamp into this list
// now sort it
Collections.sort(timestamp);

This will give me start and end range from the above list of timestamp. Is this the right way to do it or there is any better way?

timestamp.get(0); // start range
timestamp.get(timestamp.size() - 1); // end range

Update

So I should do something like below:

List<OffsetDateTime> timestamp = new ArrayList<>();
timestamp.add(OffsetDateTime.parse( "2016-01-15T00:44:59+08:30" ));
// add other timestamp string like above and then sort it
Collections.sort(timestamp);

timestamp.get(0); // start range
timestamp.get(timestamp.size() - 1); // end range

Upvotes: 1

Views: 1497

Answers (2)

Basil Bourque
Basil Bourque

Reputation: 339432

OffsetDateTime

Parse those ISO 8601 strings into java.time.OffsetDateTime objects. 

OffsetDateTime.parse( "2016-01-15T00:44:59+08:30" )

Add those date-time objects to a Collection and sort. You probably want a List such as ArrayList or a SortedSet.

The java.time classes implement the compareTo method, to fulfill their contract as a Comparable. So these objects know how to sort.

Like this:

List<OffsetDateTime> odts = new ArrayList<>();

OffsetDateTime odt = OffsetDateTime.parse( "2016-01-15T00:44:59+08:30" ) ;
odts.add( odt );
… // Parse remaining ISO 8601 strings, adding each new OffsetDateTime object to collection.

Collections.sort( odts );

Upvotes: 3

Ardeshir Ayati
Ardeshir Ayati

Reputation: 123

You must use Comparator. First of all create a class and implement Comparator. And then compare value1 and value2 with your choice. After that use this class to Collections.sort.

Regards, a.ayati

Upvotes: 0

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