How to display date of a current month with the month and year in Java?

Question

如何在Java中动态显示for循环中特定月份的日期，月份和年份？

Answer 1

Using java.time

The other Answer uses the troublesome old date-time classes, now legacy, supplanted by the java.time classes.

LocalDate

The LocalDate class represents a date-only value without time-of-day and without time zone.

Time zone

A time zone is crucial in determining a date. For any given moment, the date varies around the globe by zone. For example, a few minutes after midnight in Paris France is a new day while still “yesterday” in Montréal Québec .

Specify a proper time zone name in the format of continent/region , such as America/Montreal , Africa/Casablanca , or Pacific/Auckland . Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones, not standardized, and not even unique(!).

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

YearMonth

We care about the whole month. So use a YearMonth object to represent that.

YearMonth ym = YearMonth.from( today );

Get the first of the month.

LocalDate localDate = ym.atDay( 1 );

Loop, incrementing the date by one day at a time, until past the end of month. We can test that fact by seeing if each incremented date has the same YearMonth as today. Collect each date in a List .

List<LocalDate> dates = new ArrayList<>( 31 );  // Collect each date. We know 31 is maximum number of days in any month, so set initial capacity.
while( YearMonth.of( localDate).equals( ym ) ) {  // While in the same year-month.
    dates.add( localDate ); // Collect each incremented `LocalDate`.
    System.out.println( localDate );
    // Set up next loop.
    localDate = localDate.plusDays( 1 );
}

---

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date , Calendar , & SimpleDateFormat .

The Joda-Time project, now in maintenance mode , advises migration to the java.time classes.

To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations. Specification is JSR 310 .

Where to obtain the java.time classes?

• Java SE 8 and SE 9 and later
  • Built-in.
  • Part of the standard Java API with a bundled implementation.
  • Java 9 adds some minor features and fixes.
• Java SE 6 and SE 7
  • Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport .
• Android
  • The ThreeTenABP project adapts ThreeTen-Backport (mentioned above) for Android specifically.
  • See How to use ThreeTenABP… .

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval , YearWeek , YearQuarter , and more .

Answer 2

This demonstrates briefly some of the basics of the SimpleDateFormat and GregorianCalendar classes in Java. It was the best I could do based on your question.

import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;

public class Main {
    public static void main(String[] args) {
        int year = 2012;
        int month = 4;

        /* The format string for how the dates will be printed. */
        SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy");

        /* Create a calendar for the first of the month. */
        GregorianCalendar calendar = new GregorianCalendar(year, month, 1);

        /* Loop through the entire month, day by day. */
        while (calendar.get(GregorianCalendar.MONTH) == month) {
            String dateString = format.format(calendar.getTime());
            System.out.println(dateString);

            calendar.add(GregorianCalendar.DATE, 1);
        }
    }
}