CODEWITHSUNDEEP
javadatetimecalendar
Gytis
Gytis

Reputation: 25

Finding the repeating weekdays until specific date in JAVA

I just started learning Java, and I am having extremely hard time, it just seems so complicated compared to C. I have to write a program that detects the current day of the week, and then finds all the remaining same days until specific date. It has to be printed out by the month. So let say its 2016/3/9 now, its Wednesday. The specific date is 2016/4/8. It should print out: 2016/3: 16, 23, 30 2016/4: 6

I am supposed to use java.util.date and java.util.calendar and similar. Thanks for your answers.

Upvotes: 0

Views: 340

Answers (1)

Basil Bourque
Basil Bourque

Reputation: 338316

Avoid java.util.Date/.Calendar

FYI, the java.util.Date/.Calendar classes are terrible. While well-intentioned, they are poorly designed, confusing, and troublesome. So do not judge Java or your learning by these classes. Indeed, avoid using these classes altogether.

java.time

The old classes are so bad that Sun/Oracle gave up on them, supplanting them with new classes in the java.time framework. The java.time framework is built into Java 8 and later. See Tutorial.

LocalDate class

You want the LocalDate class to represent a date-only without time-of-day and without time zone.

You can instantiate a LocalDate by parsing a string or specifying the numbers of the year, month, and day.

LocalDate localDate = LocalDate.parse( "2016-04-08" );
LocalDate localDate = LocalDate.of( 2016 , 4 , 8 );

Today

Note that determining 'today' requires a time zone even though the resulting LocalDate stores no time zone internally. For any given moment, the date may vary around the world by time zone. A new day dawns earlier in Paris than in Montréal. 

LocalDate today = LocalDate.now( ZoneId.of( "America/Montreal" ) );

Add Weeks

Add a week to get the next date with the same day-of-week.

LocalDate next = today.plusWeeks( 1 );

Compare LocalDate

Compare LocalDate objects with the isBefore, isAfter, and isEqual methods.

I will let you put that together to complete your homework assignment.

Also, you can ask a LocalDate for a DayOfWeek object. That object has handy methods such as getDisplayName for a localized name of the day-of-week.

Upvotes: 4

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