利用Java中的Date类，编一个能够计算一个10万次循环所需的时间

public class Datesub {
public static void main(String []args){

Calendar calendar=Calendar.getInstance();
Date aa = new Date();
aa.getTime();
calendar.setTime(aa);
long timethis=calendar.getTimeInMillis();
//calendar.set(2007,7,1);
//long timeend=calendar.getTimeInMillis();
//long theday=(timeend-timethis)/(1000*60*60*24);
//System.out.println(theday);
for(int i = 0; i < 10000000;i++){
//System.out.println("safads");

}
Date bb = new Date();
bb.getTime();
calendar.setTime(bb);
long nowtime=calendar.getTimeInMillis();
long time = nowtime - timethis;
System.out.println(time+"毫秒");
}
}