String[] words = {"ace", "boom", "crew", "dog", "eon"};
List<String> wordList = Arrays.asList(words);
List<String> list=new ArrayList<String>();
list.add("王利虎");
list.add("张三");
list.add("李四");
int size=list.size();
String[] array = (String[])list.toArray(new String[size]);