用Java创建日期对象的最有效方法是什么

Question

I am creating Date object in java.

First way: By using Calender

Date today = Calendar.getInstance().getTime(); 

Second way:

with Date class

Date today1 = new Date();

Which one is most effective way here?

Answer 1

Since Java 8 you should go for LocalDateTime or LocalDate:

LocalDateTime timePoint = LocalDateTime.now(
    );     // The current date and time
LocalDate.of(2012, Month.DECEMBER, 12); // from values

LocalDate theDate = timePoint.toLocalDate(); // or
theDate = LocalDate.now(); // 

Fromt the documentation:

[For example, the existing classes (such as java.util.Date and SimpleDateFormatter) aren't thread-safe, leading to potential concurrency issues for users—not something the average developer would expect to deal with when writing date-handling code.

Some of the date and time classes also exhibit quite poor API design. For example, years in java.util.Date start at 1900, months start at 1, and days start at 0—not very intuitive.] 1

Answer 2

If you have to decide between the two. Take the new Date() . As the Calendar.getInstance().getTime() would create a Calendar instance which you could not use afterwards.

Answer 3

You can use this too! Date newDate = new GregorianCalendar(year, month, day).getTime();

Within your options, I will prefer the first alternative.