Sort ArrayList<Object> by date that contains two different Object Classes [duplicate]

Question

I have two Model classes that I am adding to ArrayList items and both of the model classes have a getDate() and I want to sort the list by date. I have been going at it for a while but can't seem to get it.

    ArrayList<Object> items = new ArrayList<>();
    ArrayList<LiftDate> liftDates = LiftDateHandler.get(getActivity()).getDate();
    ArrayList<OneRepMax> oneRepMaxes = OneRepMaxHandler.get(getActivity()).getORM();
    items.addAll(liftDates);
    items.addAll(oneRepMaxes);

Both LiftDate.class and OneRepMax.class contain:

public Date getDate() {
    return mDate;
}

How do I sort the ArrayList items based on the two Objects getDate()?

CommonsWare · Accepted Answer · 2016-01-28 19:37:27Z

2

Step #1: Define a common interface that LiftDate and OneRepMax both implement. This interface should include getDate(). I'll use Snicklefritz as the name of this interface in this answer; you should choose something more meaningful for your app.

Step #2: Have items be an ArrayList<Snicklefritz>.

Step #3: Implement a Comparator<Snicklefritz> that performs your date comparison using getDate().

Step #4: Use Collections.sort() to sort the ArrayList using your Comparator.

answered Jan 28, 2016 at 19:37

CommonsWare

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