java获取当前时间加半小时之后的时间

Question

代码如下：
Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
TimeZone timeZoneChina = TimeZone.getTimeZone("Asia/Shanghai");//获取中国的时区
sdf.setTimeZone(timeZoneChina);
String time = sdf.format( now );
Date dt = sdf.parse(time);
Calendar rightNow = Calendar.getInstance();
rightNow.setTime(dt);
rightNow.add(Calendar.HOUR_OF_DAY,1);//时间减半小时
Date dt1 = rightNow.getTime();
String reStr = sdf.format(dt1);
return reStr;
如何修改？最好能简化一下代码，而且获取系统时间比准确时间少8小时，加了代码TimeZone timeZoneChina = TimeZone.getTimeZone("Asia/Shanghai");才能正常……

Answer 1

java获取当前时间加半小时之后的时间：
SimpleDateFormat FORMAT2 = new SimpleDateFormat("HH:mm:ss");

Answer 2

public class testDate {
public static void main(String[] args) {
Calendar now = Calendar.getInstance();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
System.out.println(sdf.format(now.getTime()));
now.add(Calendar.MINUTE, 30);
System.out.println(sdf.format(now.getTime()));
}
}

Answer 3

TimeUnit.MINITE.sleep(30);
return new Data();

Answer 4

还yV🔥公