Token Grabber

TokenGrabber.java

public class TokenGrabber {
	private static final char SEPARATOR = '|';

	public static String grabTokenAt(String str, int index, char delim) {
		if (index > -1) { // Within minimum bounds.
			int pos = -1, step = 0;
			if (index > 0) {
				for (; step <= index; step++) {
					pos = str.indexOf(delim, pos + (step > 1 ? 1 : 0));
				}
			}
			if (pos < 0 && step > 0) return null; // Out of maximum bounds.
			int end = str.indexOf(delim, pos + 1);
			if (end == -1) end = str.length();
			return str.substring(pos + 1, end);
		}
		return null;
	}

	public static String grabTokenAt(String str, int index) {
		return grabTokenAt(str, index, SEPARATOR);
	}

	public static void main(String[] args) {
		String str = "foo|bar|baz|fizz|buzz";
		int frequency = new java.util.StringTokenizer(str, "|").countTokens();

		for (int i = -1; i <= frequency; i++) {
			System.out.printf("Token: %2d => %s%n", i, grabTokenAt(str, i));
		}
	}
}