This one prints : "Took : 31 ms, number of elements : 3000000"

gistfile1.java

	public static void main(String[] args) {
		int iterations = 1000000;
		List<?> items = newArrayList("foo", 23, true);
		List<Object> absoluteResult = new ArrayList<Object>(iterations*items.size());
		long before = System.currentTimeMillis();
		for (int i=0; i < iterations; i++) {
			for (int j=0 ; j< items.size(); j++) {
				absoluteResult.add(foo(items.get(j)));
			}
		}
		System.out.println("Took : "+(System.currentTimeMillis() - before)
			+" ms, number of elements : "+absoluteResult.size());
	}

	static String foo(Object s) {
		if (s instanceof String) {
			return "String";
		} else if (s instanceof Boolean) {
			return "Boolean";
		} else if (s instanceof Integer) {
			return "Integer";
		} else {
			throw new IllegalArgumentException();
		}
	}