JAVA List与数组互转

数组转List：
String[] arr = new String[] {"str1", "str2"};
List<String> list = Arrays.asList(arr);

List转数组：

List<String> list = new ArrayList<String>();

list.add("str1");
list.add("str2");
int size = list.size();
String[] arr = (String[])list.toArray(new String[size]);