CODEWITHSUNDEEP
javacalendar
Yoda
Yoda

Reputation: 18068

Usisng Calendar to determine if it is monday, tuesday or

I wanted to roll 2 days forward if it is mon, tue or wed and to the next monday if it is thu or fri. But I have problem with logic formula. It looks like Java programmers have not set final values right. The first statement seems to be always true regardless of day of the week.

import static java.util.Calendar.*;
import java.util.GregorianCalendar;


public class Demo {
    public static void main(String[] args) {
        GregorianCalendar gc = new GregorianCalendar();
        gc.roll(DAY_OF_WEEK, 2);
        if((gc.get(DAY_OF_WEEK) & (MONDAY | TUESDAY | WEDNESDAY)) == gc.get(DAY_OF_WEEK)){
            System.out.println("it is monday or tuesday or wednesday");
            gc.roll(DAY_OF_WEEK, 2);            
        }else{
            System.out.println("other day");
        }
    }
}

Upvotes: 0

Views: 94

Answers (1)

Pshemo
Pshemo

Reputation: 124275

Days of week represents values 

SUNDAY = 1;
MONDAY = 2;
TUESDAY = 3;
WEDNESDAY = 4;
THURSDAY = 5;
FRIDAY = 6;
SATURDAY = 7;

so all you need to do is check if result of gc.get(DAY_OF_WEEK) is between 2 and 4 (including), so maybe change your condition to 

if (MONDAY <= gc.get(DAY_OF_WEEK) && gc.get(DAY_OF_WEEK) <= WEDNESDAY) {

Remember, premature optimization is root of all evil. Focus on writing code for humans.

Upvotes: 4

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