Java中集合轉數組，數組轉集合

List轉換為Array：

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

String[] strings = new String[list.size()];

list.toArray(strings);

數組轉成List怎么辦呢？如下：

String[] s = {"a","b","c"};
List list = java.util.Arrays.asList(s);