How to sort array object by specific string field?

Question

This is the class of my object (I need timestamp is a string):

public class Evento{
    public String timestamp;

    public Evento(String timestamp) {
        super();
        this.timestamp = timestamp;
    }
    public String getTimestamp() {
        return timestamp;
    }
}

In my activity I have:

Evento evento = new Evento[10];
for(int i = 0; i<10; i++)
    evento[i] = new Evento(/*Casual String timestamp*/);

Then I have populated the array, how can I sort it by the timestamp inserted?

Arrays.sort() and a custom implementation of the Comparator<T> interface — EpicPandaForce
– EpicPandaForce, Commented Mar 28, 2015 at 16:23
In java 8, assuming that you want a "natural" sort on the string value, you can create the comparator like: Comparator<Evento> comparator = Comparator.comparing(Evento::getTimestamp); docs.oracle.com/javase/8/docs/api/java/util/… — Brett Okken
– Brett Okken, Commented Mar 28, 2015 at 16:29

Community · Accepted Answer · 2017-05-23 10:24:15Z

0

As previously stated, you are going to need a custom implementation of the Comparator interace. Since it is a string, I would first convert the timestamp to a date object: Converting string timestamp to date , and then you could follow this example to sort by date Sort objects in ArrayList by date?

edited May 23, 2017 at 10:24

CommunityBot

11 silver badge

answered Mar 28, 2015 at 16:31

Derek_M

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