import java.util.ArrayList;

public class Strings

$\{$

public static void swapFirstLast$($ArrayList names$)$

$\{$

String temp $=$ names.get$($names$.$length $-1)$;

names.set$($names$.$length$-1,$ names.get$(0))$;

names.set$($names$.$get$(0),$ temp$)$;

$\}$

$\}$