java如何把时间格式转为毫秒

import java.text.ParseException;
import java.text.SimpleDateFormat;

public class Cat {

 public static void main(String[] args) throws ParseException {

  String str = "201104141302";
  SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmm");
  
  long millionSeconds = sdf.parse(str).getTime();//毫秒

  System.out.println(millionSeconds);
 }
}

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1302757320000