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The Calendar() class, comparing two times?

Posted on 2003-12-11
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Last Modified: 2010-03-31
Hi i recently asked on EE which is the best class for time management, the reply i got was Calendar class, i am able to input times and create an instance of this class, however i get totally lost when i need to compare them?

Is there any easy way of comparing two times? For example;

time1 > time2

Or is there a specific method that Calendar class provides for this? If so, how would i go about using it? So far i have had no luck! Any help would be much appreciated. Thank you.

Mr S.M.
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Question by:Programmer_to_be
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imladris earned 30 total points
ID: 9922717
The Calendar class has a before and an after method that can be used for comparisons.

public boolean before(Object when);
public boolean after(Object when);
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Expert Comment

by:Mayank S
ID: 9925914
Check the Calendar API specifications for more:

http://java.sun.com/j2se/1.4.1/docs/api/java/util/Calendar.html
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Expert Comment

by:tapasvi
ID: 9926153
easiest way to compare time is through getTimeInMillis() method of Calendar class.
simple long subtraction.
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Expert Comment

by:Mayank S
ID: 9926185
Performance-wise - No. Because it would result in two method calls rather than one method-call in case of before () or after () or equals ().

Mayank.
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Expert Comment

by:tapasvi
ID: 9926266
Calendar a,b;
//initialize a and b with your time...

a.getTimeInMillis() > b.getTimeInMillis() //compare

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Expert Comment

by:Mayank S
ID: 9926344
Yeah, that's what.... it has 2 method calls. One getTimeInMillis () for a, and one for b. Its better to use after () or before() or equals () depending upon the situation.

Mayank.
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Expert Comment

by:grim_toaster
ID: 9926694
--> a.getTimeInMillis() > b.getTimeInMillis() //compare

Yes that will work, but isn't:
a.after(b);
Just so much more readable!

--> Yeah, that's what.... it has 2 method calls
When you call a.after(b) it will do exactly the same number of calls (in fact one more for the delegation, and another for the cast), but as stated above, it is just a lot easier to read, which is more important than the sub-microsecond improvement in performance.
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Author Comment

by:Programmer_to_be
ID: 9932127
Thanks everyone, all the methods suggested work great thank you.
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