Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about the time-consuming comparison between currentTimeMillis and getTimeInMillis and getTime to obtain the current timestamp. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

Code import java.util.Calendar;import java.util.Date;public class TestMillTime {public static void main (String [] args) {/ / method-long startMillis = System.currentTimeMillis (); for (int I = 0; I < 1000000; iSuppli +) {System.currentTimeMillis ();} System.out.println ("time consumed by the currentTimeMillis method:" + (System.currentTimeMillis ()-startMillis) / method 2 startMillis = Calendar.getInstance (). GetTimeInMillis (); for (int I = 0; I < 1000000; iSum +) {Calendar.getInstance (). GetTimeInMillis ();} System.out.println ("time consumed by the getTime () method in Calendar:" + (System.currentTimeMillis ()-startMillis)); / / method 3 startMillis = new Date (). GetTime () For (int I = 0; I < 1000000; iTunes +) {new Date (). GetTime ();} System.out.println ("time consumed by the getTime method in Date:" + (System.currentTimeMillis ()-startMillis));}} execute the result

Time consumed by the currentTimeMillis method: 5

The time consumed by the getTime () method in Calendar: 158

Time consumed by the getTime method in Date: 8

Analysis.

In fact, the new Date method is also called currentTimeMillis, but because it also calls the getTime method, it is easy to understand that the time consumption is a little longer than currentTimeMillis, after all, there is a data conversion from date data to long data. However, the getTimeInMillis method always loads Calendar before execution, that is, executing the Calendar.getInstance () method, which consumes a lot of time in the loading process, so it takes the longest time, so it is not recommended to use getTimeInMillis in the method of generating the current timestamp.

This is how it takes time to get the current timestamp between currentTimeMillis and getTimeInMillis and getTime shared by the editor. If you happen to have similar doubts, please refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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