TheLieOfFinal.java

import java.util.*;

public class Test
{
    public static void main(String args[])
    {
        Set<String> myStrings = new HashSet<String>();
        myStrings.add("final");
        myStrings.add("is");
        myStrings.add("often");
        myStrings.add("a lie");
        go(myStrings);
        System.out.println("I've got:");
        for (String o: myStrings) {
            System.out.println(o);
        }
    }

    public static void go(final Set<String> s) {
        s.clear();
    }
}

ZOutput

> java -cp . Test
I've got: