Question

如何正确地统计函数执行时间

Answer 1

程序执行时间可以用设置断点的方法测试出来

Answer 2

package play.b;

import java.util.Calendar;
import java.util.Date;

public class Me {

public static int getDayOfYear(Date date) {
Calendar cl = Calendar.getInstance();
cl.setTime(date);
return cl.get(Calendar.DAY_OF_YEAR);
}

public static void main(String[] args) {
System.out.println(getDayOfYear(new Date()));
}
}