import  java.util.ArrayList;
import  java.util.Collections;

public class Sort
{
    public static void main(String[] args)
    {
        ArrayList<String> myList = new ArrayList<>();
        myList.add("red"); myList.add("green"); myList.add("blue");

        System.out.println( myList );  // Unsorted

        Collections.sort( myList );    // Sorts a list

        System.out.println( myList );  // Sorted
    } 

}