Tuesday, July 12, 2011

How to sort array list?

Sort by simple type property

1. Implement the Comparable interface

public class Item implements Comparable<Item> {


2. Implement the compareTo method.

public int compareTo(Item another) {
//Compare the name
return this.name.compareTo(another.name);

3. Call sort

List<Item> items = ..

Sort by user defined property

1. Create a new class

import java.util.Comparator;
public class ItemCompareByLocation implements Comparator<Item>{
public int compare(Item arg0, Item arg1) {
return arg0.getLocation().compareTo(arg1.getLocation());

2. Call sort

Collections.sort(items, new ItemCompareByLocation());

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