Find an object inside ArrayList Java

Question

I have an ArrayList of objects. Each object is of type Player (one of the classes that I have). Each Player object has a getName() method and a getValue() method. The getValue method is of integer type. All the Player objects go into an ArrayList, listOfPlayers. How do I find a PLayer object with the highest getValue()?

I know there is a method called Collections.max(), but for me it only seems to work if the ArrayList is just full of integers.

Thanks

Use a comparator, sort the list, retrieve the first element. Iterate through all elements and get the one with the highest. — Sotirios Delimanolis, Oct 05 '13 at 05:20
http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html#max(java.util.Collection, java.util.Comparator) — Rohit Jain, Oct 05 '13 at 05:21

score 5 · Accepted Answer · edited May 23 '17 at 11:57

5

Use max() with comparator

Collection.max(collection, customComparator);

Also See

How to use custom Comparator

edited May 23 '17 at 11:57

Community

1
1

answered Oct 05 '13 at 05:21

jmj

237,923
42
401
438

score 2 · Answer 2 · answered Oct 05 '13 at 05:26

You need to Implement Comparator for your class like this

Comparator<Player> cmp = new Comparator<Player>() {
    @Override
    public int compare(Player o1, Player o2) {
        return Integer.valueOf(o1.getValue()).compareTo(Integer.valueOf(o2.getValue()));
    }
};

then call

  Collections.max(listOfPlayers, cmp);

Find an object inside ArrayList Java

2 Answers2