Sorting ArrayList by comparator

Question

I have an ArrayList containing CoolMove elements and want to sort it by the values CoolMove.getValue() returns (these values are Doubles). I read that you can sort using a comparator class and in an attempt to do this I made the following:

I have 2 classes, one having these code lines:

ArrayList<CoolMove> moveList = getMoves();
Arrays.sort(fishMoves, new myComp());

My 2nd class is this comparator:

class myComp implements Comparator<CoolMove> {

    @Override
    public int compare(CoolMove move1, CoolMove move2) {
        return Double.compare(move1.getValue(), move2.getValue());
    }
}

My problem is that at Arrays.sort I get this error: The method sort(T[], Comparator) in the type Arrays is not applicable for the arguments (ArrayList, myComp) How can I fix this?

Possible duplicate of Sort ArrayList of custom Objects by property — LuCio
– LuCio, Commented Dec 3, 2018 at 15:11

Ousmane D. · Accepted Answer · 2018-12-03 15:06:51Z

3

moveList is a list not an array, use the sort method from Collections:

Collections.sort(moveList, new myComp());

answered Dec 3, 2018 at 15:06

Ousmane D.

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Naman · Accepted Answer · 2018-12-03 15:12:49Z

1

You can simplify all of it using List.sort(Comparator<? super E> c)as:

moveList.sort(Comparator.comparingDouble(CoolMove::getValue));

answered Dec 3, 2018 at 15:12

Naman

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Comments

forpas · Accepted Answer · 2018-12-03 15:09:01Z

0

Sort the list (JDK 8.0)

moveList.sort(new myComp());

edited Dec 3, 2018 at 15:09

answered Dec 3, 2018 at 15:07

forpas

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1 Comment

Ousmane D. Over a year ago

worth saying, this is only available as of JDK8

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