ArrayList与数组之间相互转换

List<String> list = new ArrayList<String>();
String[] array = (String[]) list.toArray();

List<String> list = null;
String[] array = new String[3];
list = Arrays.asList(array);
//用Arrays.asList()方法得到的List对象是长度固定的
//当对list进行remove、add等操作时会出UnsupportedOperationException异常
//可用下述方式解决
list = new ArrayList<String>(Arrays.asList(array));