Generate Random String of given length with alphabets

GenerateRandomString.java

public static String generateString(int length) {
    String characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    Random rng = new Random();
    char[] text = new char[length];
    for (int i = 0; i < length; i++) {
        text[i] = characters.charAt(rng.nextInt(characters.length()));
    }
    return new String(text);
}