java List与数组互转

list转数组

List<String> list = new ArrayList<String>();  
list.add("1");  
list.add("2");  
String[] arr = (String[])list.toArray(new String[list.size()]); 

数组转list

String[] arr = new String[] {"1", "2"};  
List<String> list = Arrays.asList(arr);