Java DayCounter problem | Java Community | Help. Code. Learn. | Page 1

cerulean thicket Sep 28, 2022, 6:34 AM

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This code is supposed to take two dates
and then find how many days are in between them
but I keep getting exit status 1 and I do not understand why. Can someone help me please?

snow magnet Sep 28, 2022, 6:35 AM

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You don’t provide a return type on your daysDiff method

fringe jacinth Sep 28, 2022, 6:36 AM

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you might want to use LocalDate instead of Date

cerulean thicket Sep 28, 2022, 6:36 AM

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oh bruh lol my bad

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It completely missed my eye

fringe jacinth Sep 28, 2022, 6:36 AM

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and not use Calendar

cerulean thicket Sep 28, 2022, 6:36 AM

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fringe jacinth you might want to use `LocalDate` instead of `Date`

Whats the difference

snow magnet Sep 28, 2022, 6:36 AM

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next time make sure to read your stack trace

cerulean thicket Sep 28, 2022, 6:37 AM

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fringe jacinth and not use `Calendar`

and whats wrong with Calendar?

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my bad, I dont understand 😢

fringe jacinth Sep 28, 2022, 6:37 AM

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the java.time API (containing LocalDate and other classes) is newer, more modern and less subject to errors than Date/Calendar

cerulean thicket Sep 28, 2022, 6:38 AM

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okay, so just replace Date with LocalDate?

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This is the first I've heard of LocalDate, thats why Im making sure lol

snow magnet Sep 28, 2022, 6:39 AM

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https://stackoverflow.com/questions/28730136/should-i-use-java-util-date-or-switch-to-java-time-localdate

Stack Overflow

Should I use java.util.Date or switch to java.time.LocalDate

Edit: Well, apparently it was too opinion based, so let me try to reword it more precisely -

Are there any clear caveats or drawbacks of using LocalDate, LocalTime etc. in a Java code that does not

cerulean thicket Sep 28, 2022, 6:40 AM

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ohhhh I see, that makes a lot of sense

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but what would Calendar be changed to, another form of LocalDate?

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new problem, what does a "cannot find symbol" error mean?

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as in, what symbol cannot be found?

fringe jacinth Sep 28, 2022, 6:51 AM

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it's not a 1:1 change

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you can get a LocalDate with LocalDate.of(year, month, day)

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a LocalDate represents a date

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for the difference, you need a Duration

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you can obtain it using Duration.between(someLocalDate, otherLocalDate)

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my fault, Period, not Duration

cerulean thicket Sep 28, 2022, 6:56 AM

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so Period.between(LocalDate, other LocalDate)

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wouldnt that essentialy get rid of my method though

fringe jacinth Sep 28, 2022, 6:58 AM

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that returns a Period object

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with a toDays method

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so you could do it like that

public static int daysDiff(LocalDate one, LocalDate two){
    Period period = Period.between(one, two);
    return period.toDays();
}

cerulean thicket Sep 28, 2022, 7:00 AM

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Oh waiiit, I think I am starting to understand now

cerulean thicket Sep 28, 2022, 7:01 AM

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fringe jacinth you can get a `LocalDate` with `LocalDate.of(year, month, day)`

but how would I incorperate the LocalDate System into this

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I am thinking something like this

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LocalDate today = new localDate();

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and then

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today.of(year, month, day)

fringe jacinth Sep 28, 2022, 7:01 AM

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LocalDate today=LocalDate.now();

cerulean thicket Sep 28, 2022, 7:01 AM

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^ with those 3 variables being the 3 input.nextInts()

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oh

fringe jacinth Sep 28, 2022, 7:02 AM

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LocalDate someLocalDate=LocalDate.of(year, month, day);

cerulean thicket Sep 28, 2022, 7:06 AM

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I seem to have gotten a bunch of errors lol

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fringe jacinth Sep 28, 2022, 7:07 AM

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you need to import it

cerulean thicket Sep 28, 2022, 7:07 AM

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Doesnt util.* import everything time based?

fringe jacinth Sep 28, 2022, 7:07 AM

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import java.time.*;

frozen oak Sep 28, 2022, 7:08 AM

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cerulean thicket Doesnt util.* import everything time based?

java.util.Date is older API... java.time.* is a newer and more powerful incarnation.

cerulean thicket Sep 28, 2022, 7:08 AM

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i see, I should use that more instead

frozen oak Sep 28, 2022, 7:08 AM

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I would.

fringe jacinth Sep 28, 2022, 7:09 AM

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oh and use period.get(ChronoUnit.DAYS) if you want to get the total days

cerulean thicket Sep 28, 2022, 7:10 AM

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fringe jacinth oh and use `period.get(ChronoUnit.DAYS)` if you want to get the total days

for the return statement, correct?

fringe jacinth Sep 28, 2022, 7:10 AM

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and period.getDays() removes all full months

fringe jacinth Sep 28, 2022, 7:10 AM

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cerulean thicket for the return statement, correct?

yes except you want to remove full months

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If you have a difference of 1 month and 2 days, getDays will give you 2 while get(ChronoUnit.DAYS) will give you 32 (if it is a month with 30 days)

cerulean thicket Sep 28, 2022, 7:12 AM

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Ohhh i see

fringe jacinth Sep 28, 2022, 7:12 AM

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the date/time stuff in java.util is the old thing that shouldn't be used any more unless necessary (e.g. Date/Calendar)

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java.time contains the newer stuff

cerulean thicket Sep 28, 2022, 7:14 AM

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damn, Im really using something super outdated 😭

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I wonder why teachers dont teach this stuff instead

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bc I've been using this for so long

fringe jacinth Sep 28, 2022, 7:15 AM

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most other stuff in java.util is fine

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but not datetime related stuff

cerulean thicket Sep 28, 2022, 7:15 AM

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oh okay

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also, what is to become of my Result object?

fringe jacinth Sep 28, 2022, 7:16 AM

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ig Result is one of your classes?

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what should it contain?

cerulean thicket Sep 28, 2022, 7:16 AM

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The result was supposed to be an object, but it helped find the difference between the two days

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28

snow magnet Sep 28, 2022, 7:20 AM

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cerulean thicket The result was supposed to be an object, but it helped find the difference betwe...

What’s the problem

cerulean thicket Sep 28, 2022, 7:20 AM

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Apparently Result itself cannot be found

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the symbol I mea

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mean*

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Because of the middle two errors

fringe jacinth Sep 28, 2022, 7:22 AM

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Did you create a Result class?

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for the errors with LocalDate and period, use import java.time.*;

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but Result doesn't exist

cerulean thicket Sep 28, 2022, 7:23 AM

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fringe jacinth for the errors with LocalDate and period, use `import java.time.*;`

I did, its just line 1 isnt shown right here

fringe jacinth Sep 28, 2022, 7:23 AM

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ah ok

cerulean thicket Sep 28, 2022, 7:25 AM

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okay, i managed to filter it down to one last error

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and its that ChronoUnit cannot be found

fringe jacinth Sep 28, 2022, 7:27 AM

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ChronoUnit is in java.time.temporal

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so import java.time.temporal.ChronoUnit;

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Does your IDE not automatically add imports?

cerulean thicket Sep 28, 2022, 7:28 AM

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no it doesn't 😭

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what IDE does?

fringe jacinth Sep 28, 2022, 7:29 AM

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e.g. Eclipse and IntelliJ

cerulean thicket Sep 28, 2022, 7:30 AM

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also, I got a lossy conversion error from long to int

fringe jacinth Sep 28, 2022, 7:30 AM

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at least if you use autocomplete

cerulean thicket Sep 28, 2022, 7:30 AM

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looks like ill have to use eclipse soon

fringe jacinth Sep 28, 2022, 7:30 AM

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oh right, those things use long

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not int

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you have two options: either use long or cast it to int

cerulean thicket Sep 28, 2022, 7:31 AM

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omg

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I just turned it into a long

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and it worked

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Thank you for being so patient with me

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Im not too good at coding lol, especially with all these new things that I wasnt taught

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I really appreciate it

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all of you : )

snow magnet Sep 28, 2022, 8:10 AM

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You should definitely switch to eclipse or IntelliJ

cerulean thicket Sep 28, 2022, 5:24 PM

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hiii, I keep getting a error saynig i cant find a class with the main method

frozen oak Sep 30, 2022, 6:14 PM

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cerulean thicket

You can't name your class starting with a number. See the red squiggly underneath it?

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