CODEWITHSUNDEEP
javacalendar
user1096311
user1096311

Reputation:

How to get current time in java without Creating an Object each time?

I know there are a lot os posts about how to get the current time in java. But im planning to code a getAge Method in a Persona class. The problem is, I need to get the current time each time method is called. Let's say a billion clients execute getMethod(with miliseconds, perhaps seconds of difference), a billion of objects will be created for such a simple thing. The only thing I did was create a member static in Person, so Person will share the instace. But this doesnt prevent the object creation.

public class Person{
//Some Attributes
private static Calendar now;
private Calendar birthDate;

public short getAge(){
now = Calendar.getInstance();

return  (short) (( now.getTimeInMillis() - birthDate.getTimeInMillis())/ 31536000000L;
}}

If you know some library that have this implemented without the waste of such heap size. Please tell me.

Thanks.

Upvotes: 6

Views: 13502

Answers (3)

HJW
HJW

Reputation: 23443

With the time stamp obtained through optimized means, what additional processing / overheads will be required to make the obtained time stamp meaningful?

http://joda-time.sourceforge.net

If you would like a library to work with date and time, go with Joda Time. I wouldn't bang on any work around. 

DateTime dt = new DateTime();  // current time

I suggest that if performance is a key concern / limiting issue that you run tests to ensure that any work around that you accept achieves non-functional results that outweigh code readability.

Upvotes: 0

anubhava
anubhava

Reputation: 785316

You can also create a Calendar instance once and keep calling:

calendar.setTimeInMillis ( System.currentTimeMillis() );

to set the current time in calendar instance and use that calendar object to do any date calculation.

Upvotes: 6

Keppil
Keppil

Reputation: 46219

No need to create a Calendar, you can get a long from the static method 

System.currentTimeMillis();

Upvotes: 9

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