// Too bad Java doesn't support generic arrays or varargs
public static Stack<String> makeName(String... strings) {
Stack<String> rv = Stack.<String>emptyInstance();
for (int i = strings.length - 1; i >= 0; i--) {
rv = rv.push(strings[i]);
}
return rv;
}
public Stack<T> concat(Stack<T> stack) {
Stack<T> rv = this;
for (T elt : stack) {
rv = rv.push(elt);
}
return rv;
}
public Stack<T> addUnique(Stack<T> stack) {
Stack<T> rv = this;
for (T elt : stack) {
if (rv.contains(elt)) continue;
rv = rv.push(elt);
}
return rv;
}
protected Stack<T> reverseImpl(Stack<T> stack) {
return tail.reverseImpl(stack.push(head));
}