List 数组转换

public static void main(String[] args) {
	List<String> strList = new ArrayList<String>();
	strList.add("aa");
	strList.add("bb");
	String[] arr =  (String[])strList.toArray(new String[strList.size()]);  //正确
	String[] arr2 = (String[])strList.toArray(); //错误
}