String数组转List，List转String数组

List 转换为 String数组
    List<String> list = new ArrayList<String>();   
    list.add("a1");   
    list.add("a2");   
    String[] toBeStored = list.toArray(new String[list.size()]);   
    for(String s : toBeStored) {   
         System.out.println(s);   
    }   


String 数组转换为 List
    String[] arr = new String[] {"1", "2"}; 
    List list = Arrays.asList(arr);