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Mudar Switch/Case para ArrayList

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Boas, pretendo comparar a presença de vogais numa palavra e queria mudar um switch/case statement para um arraylist de forma a que a comparação fosse feita caso existisse alguma vogal da lista na palavra que estou a avaliar. Só que não sei como dar a volta.

É no seguinte código que pretendo mudar (no final):

import java.util.ArrayList;
import java.util.List;

public class SSP implements IState {
	private int cost; // cost from the receiver to its father
	private String s;

	public SSP(String str) {
		this(str, 0);

	public SSP(String str, int cost) {
		s = str;
		this.cost = cost;

	public boolean equals(Object that) {
		if (that instanceof SSP) {
			SSP b = ((SSP) that);
			return s.equals(b.s);
		} else
			return false;

	public boolean isGoal(IState that) {
		return this.equals(that);

	public String toString() {
		return s;

	 * @return a list with all configuration states which are reachable from the
	 *         receiver, when the rules of our problem are applied.
	public List<IState> children() {
		int n;
		List<IState> l = new ArrayList<IState>();
		SSP child;
		for (int i = 0; i < s.length() - 1; i++)
			for (int j = i + 1; j < s.length(); j++) {
				StringBuffer schild = new StringBuffer(s);
				n = swap(schild, i, j);
				child = new SSP(schild.toString(), n);

		return l;

	public int getCost() {
		return cost;

	private static int swap(StringBuffer s, int i, int j) {
		char c = s.charAt(i);
		char d = s.charAt(j);
		s.setCharAt(i, d);
		s.setCharAt(j, c);
		if (isVowel(c) && isVowel(d))
			return 200;
		if (isVowel(c) || isVowel(d))
			return 11;
		return 2;

	private static boolean isVowel(char c) {
		switch (c) {
		case 'a':
		case 'e':
		case 'i':
		case 'o':
		case 'u':
			return true;
		return false;

Agradeço qualquer ajuda.

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