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Reputation: 6139

compareTo in WritableComparable is intended for?

I am trying to emit 2 matrices as my key and value. One matrix as key and the other as value. I wrote my class which implements WritableComparable.

But I am confused what to write with in:

@Override
    public int compareTo(MW o) {
    // TODO Auto-generated method stub
    return 0;
}

What is this CompareTo() intended for?

Upvotes: 0

Views: 981

Answers (1)

Thomas Jungblut
Thomas Jungblut

Reputation: 20969

To cite the Java documentation:

This interface imposes a total ordering on the objects of each class that implements it. This ordering is referred to as the class's natural ordering, and the class's compareTo method is referred to as its natural comparison method.

Usually you return 0 if both objects are the same, and with a number higher or lower you determine the order between your objects.

Upvotes: 1

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