Identify the output or exception the following code produces:

List tokens = new ArrayList();

String tag = "To protect the world from devastation";

tokens.add(tag.split(" ")); tokens.add(new String("Prepare for trouble").split(" "));

tokens.add(new String("Make it double").split(" "));

tokens.add(tokens.remove(0));

for(String token : tokens.get(1))

System.out.println(token);