Java find letters in string

/**
 * @author lautturi.com 
 * Java example: find letters and print their index position in java
 */

public class Lautturi {

	public static void main(String[] args) {
		String stringName = "Lautturi java";
		String characterToFind = "a";

		for (int i = 0; i < stringName.length(); i++) {
			if (stringName.substring(i, i + 1).equals(characterToFind)) {
				System.out.println(characterToFind + " found at " + i);
			}

		}
	}

}

output:

a found at 1
a found at 10
a found at 12