public static String randomString(final int size) {
		return randomObject(new RandomObjectFunction<String>() {
			public String get() {
				StringBuilder sb = new StringBuilder(size);
				for (int i = 0; i < size; i++) {
					char c = (char) ((r.nextBoolean() ? 'A' : 'a') + r
							.nextInt('z' - 'a'));
					sb.append(c);
				}
				return sb.toString();
			}
		});
	}