Alphabetically Sort a Java Collection based upon the 'toString' value of its member items

Question

Assume I have a user defined Java class called Foo such as:

public class Foo 
{

    private String aField;

    @Override
    public String toString()
    {         


        

Answer 1

Collections.sort(fooList,
                 new Comparator()
                 {
                     public int compare(Foo f1, Foo f2)
                     {
                         return f1.toString().compareTo(f2.toString());
                     }        
                 });

Assuming that toString never returns null and that there are no null items in the list.