Java Convert ArrayList<String> to String []

public static void main(String[] args) {
List<String> stockList = new ArrayList<String>();
stockList.add("quyang");
stockList.add("zaidong");
stockList.add("youheng");
String[] stockArr = new String[stockList.size()];
stockArr = stockList.toArray(stockArr);
for (String s : stockArr) {
System.out.println(s);
}
SmsContent smsContent = new SmsContent();
smsContent.content = "hello";
smsContent.smsSend = new Date();
System.out.println(smsContent.toString());

List<SmsContent> list = new ArrayList<SmsContent>();
SmsContent smsContent1 = new SmsContent();
smsContent1.content = "我很丑但我很温柔";
smsContent1.smsSend = new Date();
SmsContent smsContent2 = new SmsContent();
smsContent2.content = "有一点动心";
smsContent2.smsSend = new Date();
SmsContent smsContent3 = new SmsContent();
smsContent3.content = "大城小爱";
smsContent3.smsSend = new Date();
list.add(smsContent1);
list.add(smsContent2);
list.add(smsContent3);
StringBuffer sb = new StringBuffer();
for (SmsContent s : list) {
sb.append(s.toString()).append("\n");
}
System.out.println(sb.toString());
}