Sorting an ArrayList lexicographically?

Question

i want to sort an ArrayList that has the type Node, like this :

 [[country1: null], [name2: null], [city3: null], [region4: null], [name6: null]]

To get the value of Node's name i use the function getNodeName() so

 ArrayNode.get(0).getNodeName()  // return country1

I have looking into collection.sort but i don't know how i will do it, Thank u in advance.

How does the `Node` class look? By what of it's properties to you want to sort? — Philipp Reichart, May 23 '12 at 21:21
Not an *exact* duplicate, but pretty much of http://stackoverflow.com/questions/2784514/sort-arraylist-of-custom-objects-by-property — Corbin, May 23 '12 at 21:21

score 3 · Answer 1 · answered May 23 '12 at 21:21

3

I think you want java.util.Comparator. You can use that with Collections.sort

answered May 23 '12 at 21:21

ControlAltDel

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score 3 · Answer 2 · answered May 23 '12 at 21:21

3

Create a Comparator that sorts by node name, then Collections.sort(list,comparator)

answered May 23 '12 at 21:21

Jeff Storey

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score 3 · Accepted Answer · answered May 23 '12 at 21:29

Use Comparator object to define comparison logic.

Something like that:

ArrayList<Node> nodes;
        Collections.sort(nodes, new Comparator<Node>() {
            @Override
            public int compare(Node o1, Node o2) {
                return o1.getNodeName().compareTo(o2.getNodeName());
            }
        });

Sorting an ArrayList lexicographically?

3 Answers3