How to sort ArrayList of model type according to date (a string type variable in ArrayList)?

Question

I am trying to sort an ArrayList of model type, ArrayList jobCards according to string type of date field called dueDate.

I tried adding the following in model.

@Override
public int compareTo(@NonNull TodayModel o) 
{
    return o.newDueDate.compareTo(this.newDueDate);
}

And then applying

Collections.sort(jobCards);

Answer 1

Though you have the right idea, your method isn't wired up to the IComparable interface.

Define your JobCards class like so.

public class JobCards : IComparable<JobCards> {

The Visual Studio editor will highlight IComparable , offering two options to correct it. Choose Implement explicitly , and let the editor add the stub method. which will be called IComparable.CompareTo ; note the difference between that and what you have. Then, replace the statement that throws a NotImplementedException with your code, and you should be good to go.