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.

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

3. Call sort

List<Item> items = ..
items.sort();

Sort by user defined property

1. Create a new class

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

2. Call sort

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